[GH-ISSUE #975] ERROR: Please upgrade/downgrade ArduinoJSON

kerem commented

2026-02-28 00:02:26 +03:00

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Originally created by @nc9710 on GitHub (Nov 2, 2018).
Original GitHub issue: https://github.com/SpacehuhnTech/esp8266_deauther/issues/975

Having an error when compiling, ArduinoJSON is v5. Please help.

WARNING: Category '' in library ArduinoJson is not valid. Setting to 'Uncategorized'
esp8266_deauther:21:2: error: #error Please upgrade/downgrade ArduinoJSON library to version 5!

 #error Please upgrade/downgrade ArduinoJSON library to version 5!

  ^

esp8266_deauther:24:17: error: oui.h: No such file or directory

 #include "oui.h"

                 ^

compilation terminated.

exit status 1
#error Please upgrade/downgrade ArduinoJSON library to version 5!

Originally created by @nc9710 on GitHub (Nov 2, 2018). Original GitHub issue: https://github.com/SpacehuhnTech/esp8266_deauther/issues/975 Having an error when compiling, ArduinoJSON is v5. Please help. ``` WARNING: Category '' in library ArduinoJson is not valid. Setting to 'Uncategorized' esp8266_deauther:21:2: error: #error Please upgrade/downgrade ArduinoJSON library to version 5! #error Please upgrade/downgrade ArduinoJSON library to version 5! ^ esp8266_deauther:24:17: error: oui.h: No such file or directory #include "oui.h" ^ compilation terminated. exit status 1 #error Please upgrade/downgrade ArduinoJSON library to version 5! ```

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kerem commented

2026-02-28 00:02:27 +03:00

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@mrohit2011 commented on GitHub (Nov 10, 2018):

I am too facing the same issue.

@mrohit2011 commented on GitHub (Nov 10, 2018): I am too facing the same issue.

kerem commented

2026-02-28 00:02:27 +03:00

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@forseenink3238 commented on GitHub (Nov 29, 2018):

Me too but the source Is actually having a problem

@forseenink3238 commented on GitHub (Nov 29, 2018): Me too but the source Is actually having a problem

kerem commented

2026-02-28 00:02:27 +03:00

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@MartieTheSmartie commented on GitHub (Dec 13, 2018):

Same problem @spacehuhn is this fixable?

@MartieTheSmartie commented on GitHub (Dec 13, 2018): Same problem @spacehuhn is this fixable?

kerem commented

2026-02-28 00:02:27 +03:00

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@spacehuhn commented on GitHub (Dec 14, 2018):

The obvious fix is to comment out the 3 lines (17,21,22) that are causing the error:
https://github.com/spacehuhn/esp8266_deauther/blob/master/esp8266_deauther/esp8266_deauther.ino#L17

But you still have to install the correct ArduinoJSON library version!
Check the Arduino library manager, your Arduino library folder and select the right board (under deauther not esp8266 section).

@spacehuhn commented on GitHub (Dec 14, 2018): The obvious fix is to comment out the 3 lines (17,21,22) that are causing the error: https://github.com/spacehuhn/esp8266_deauther/blob/master/esp8266_deauther/esp8266_deauther.ino#L17 But you still have to install the correct ArduinoJSON library version! Check the Arduino library manager, your Arduino library folder and select the right board (under deauther not esp8266 section).

kerem commented

2026-02-28 00:02:27 +03:00

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@spacehuhn commented on GitHub (Jan 4, 2019):

Check your Arduino library folder (C:\Users\user\Documents\Arduino\libraries) and delete the ArduinoJSON folder if it exists.
If the library in there is the wrong version, you might not be able to up/downgrade it from the Arduino library manager, so you have to delete it maybe.
The problem is that Arduino gives priority to the libraries in your Documents\Arduino folder instead of the one that comes with the deauther pboard ackage.

Pro Tip: Read the error message carefully! It usually tells you the error 😉

@spacehuhn commented on GitHub (Jan 4, 2019): Check your Arduino library folder (C:\Users\user\Documents\Arduino\libraries) and delete the ArduinoJSON folder if it exists. If the library in there is the wrong version, you might not be able to up/downgrade it from the Arduino library manager, so you have to delete it maybe. The problem is that Arduino gives priority to the libraries in your Documents\Arduino folder instead of the one that comes with the deauther pboard ackage. Pro Tip: Read the error message carefully! It usually tells you the error 😉

kerem commented

2026-02-28 00:02:27 +03:00

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@Cubensiss commented on GitHub (Jan 6, 2019):

In this folder is not ArduinoJSON folder only readmme datei

@Cubensiss commented on GitHub (Jan 6, 2019): In this folder is not ArduinoJSON folder only readmme datei

kerem commented

2026-02-28 00:02:27 +03:00

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@iomega25 commented on GitHub (Jan 9, 2019):

esp8266_deauther:33:2: error: #error Please upgrade/downgrade ArduinoJSON library to version 5!

 #error Please upgrade/downgrade ArduinoJSON library to version 5!

  ^

esp8266_deauther:34:2: error: #endif without #if

 #endif

  ^

In file included from sketch\Settings.h:11:0,

                 from D:\esp8266_deauther-master\esp8266_deauther\esp8266_deauther.ino:39:

A_config.h:7:24: error: SH1106Wire.h: No such file or directory

 #include "SH1106Wire.h"

                        ^

compilation terminated.

exit status 1
#error Please upgrade/downgrade ArduinoJSON library to version 5!

WARNING: Category '' in library ArduinoJson is not valid. Setting to 'Uncategorized'
esp8266_deauther:33:2: error: #error Please upgrade/downgrade ArduinoJSON library to version 5!

 #error Please upgrade/downgrade ArduinoJSON library to version 5!

  ^

esp8266_deauther:34:2: error: #endif without #if

 #endif

  ^

In file included from sketch\Settings.h:11:0,

                 from D:\esp8266_deauther-master\esp8266_deauther\esp8266_deauther.ino:39:

A_config.h:7:24: error: SH1106Wire.h: No such file or directory

 #include "SH1106Wire.h"

                        ^

compilation terminated.

exit status 1
#error Please upgrade/downgrade ArduinoJSON library to version 5!

please help

@iomega25 commented on GitHub (Jan 9, 2019): ``` esp8266_deauther:33:2: error: #error Please upgrade/downgrade ArduinoJSON library to version 5! #error Please upgrade/downgrade ArduinoJSON library to version 5! ^ esp8266_deauther:34:2: error: #endif without #if #endif ^ In file included from sketch\Settings.h:11:0, from D:\esp8266_deauther-master\esp8266_deauther\esp8266_deauther.ino:39: A_config.h:7:24: error: SH1106Wire.h: No such file or directory #include "SH1106Wire.h" ^ compilation terminated. exit status 1 #error Please upgrade/downgrade ArduinoJSON library to version 5! WARNING: Category '' in library ArduinoJson is not valid. Setting to 'Uncategorized' esp8266_deauther:33:2: error: #error Please upgrade/downgrade ArduinoJSON library to version 5! #error Please upgrade/downgrade ArduinoJSON library to version 5! ^ esp8266_deauther:34:2: error: #endif without #if #endif ^ In file included from sketch\Settings.h:11:0, from D:\esp8266_deauther-master\esp8266_deauther\esp8266_deauther.ino:39: A_config.h:7:24: error: SH1106Wire.h: No such file or directory #include "SH1106Wire.h" ^ compilation terminated. exit status 1 #error Please upgrade/downgrade ArduinoJSON library to version 5! ``` please help

kerem commented

2026-02-28 00:02:27 +03:00

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@tobozo commented on GitHub (Jan 9, 2019):

I think the error message is trying to tell you to do this :

@tobozo commented on GitHub (Jan 9, 2019): I think the error message is trying to tell you to do this : ![image](https://user-images.githubusercontent.com/1893754/50904266-2e4fc700-1420-11e9-98dc-1fce0d52f7fd.png)

kerem commented

2026-02-28 00:02:27 +03:00

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@pjvander commented on GitHub (Jan 11, 2019):

Quick note about a mistake I made, if you're still having trouble. I had a newer ESP8266 board installed (2.5.0b I think) when I installed ArduinoJson. Went back and installed 2.0.0 but was still having issues with ArduinoJson until I removed/re-added it. HTH

@pjvander commented on GitHub (Jan 11, 2019): Quick note about a mistake I made, if you're still having trouble. I had a newer ESP8266 board installed (2.5.0b I think) when I installed ArduinoJson. Went back and installed 2.0.0 but was still having issues with ArduinoJson until I removed/re-added it. HTH

kerem commented

2026-02-28 00:02:27 +03:00

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@FaroJoaoFaro commented on GitHub (Jan 23, 2019):

Hello
When I go to the Arduino Library I don't have ArduinoJson
What can I do?

@FaroJoaoFaro commented on GitHub (Jan 23, 2019): Hello When I go to the Arduino Library I don't have ArduinoJson What can I do?

kerem commented

2026-02-28 00:02:27 +03:00

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@sarimbinwaseem commented on GitHub (Jan 29, 2019):

Check your Arduino library folder (C:\Users\user\Documents\Arduino\libraries) and delete the ArduinoJSON folder if it exists.
If the library in there is the wrong version, you might not be able to up/downgrade it from the Arduino library manager, so you have to delete it maybe.
The problem is that Arduino gives priority to the libraries in your Documents\Arduino folder instead of the one that comes with the deauther pboard ackage.

Pro Tip: Read the error message carefully! It usually tells you the error 😉

Still not working.....
What I have done...

Deleted the JSON folder from Documents/Arduino
Downloaded Arduino JSON V 5.0.0 from page: https://github.com/bblanchon/ArduinoJson/releases?after=v5.1.0-beta.1
Included in IDE.
Selected Node MCU 12E from Deauther Module section
But still problem is there..

@sarimbinwaseem commented on GitHub (Jan 29, 2019): > Check your Arduino library folder (C:\Users\user\Documents\Arduino\libraries) and delete the ArduinoJSON folder if it exists. > If the library in there is the wrong version, you might not be able to up/downgrade it from the Arduino library manager, so you have to delete it maybe. > The problem is that Arduino gives priority to the libraries in your Documents\Arduino folder instead of the one that comes with the deauther pboard ackage. > > Pro Tip: Read the error message carefully! It usually tells you the error 😉 Still not working..... What I have done... 1. Deleted the JSON folder from Documents/Arduino 2. Downloaded Arduino JSON V 5.0.0 from page: https://github.com/bblanchon/ArduinoJson/releases?after=v5.1.0-beta.1 3. Included in IDE. 4. Selected Node MCU 12E from Deauther Module section But still problem is there..

kerem commented

2026-02-28 00:02:27 +03:00

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@sarimbinwaseem commented on GitHub (Jan 29, 2019):

Hello
When I go to the Arduino Library I don't have ArduinoJson
What can I do?

Download it from https://github.com/bblanchon/ArduinoJson/releases?after=v5.1.0-beta.1
and add it to Documents/Arduino then go to sketch tab in Arduino IDE and include it from there..

@sarimbinwaseem commented on GitHub (Jan 29, 2019): > Hello > When I go to the Arduino Library I don't have ArduinoJson > What can I do? Download it from https://github.com/bblanchon/ArduinoJson/releases?after=v5.1.0-beta.1 and add it to Documents/Arduino then go to sketch tab in Arduino IDE and include it from there..

kerem commented

2026-02-28 00:02:27 +03:00

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@labomb commented on GitHub (Feb 11, 2019):

In my case, I've determined that the problem was that the deauther board package that is required to be installed via the board manager (http://phpsecu.re/esp8266/package_deauther_index.json) includes the ArduinoJson library. On my Windows system, it was found here after installation:

%USERPROFILE%\AppData\Local\Arduino15\packages\deauther\hardware\esp8266\2.0.0-deauther\libraries

I deleted the ArduinoJson directory located there, and then installed the latest version 5 iteration (in my case, version 5.13.4) via the IDE Library Manager . This will install the ArduinoJson lib in your Documents folder (specifically, %USERPROFILE%\Documents\Arduino\libraries).

Oddly, the ArduinoJson library included with the deauther board package appears to be a valid version (5.13.0)... but I still got the upgrade/downgrade error message until it was deleted. Haven't had an issue since.

@labomb commented on GitHub (Feb 11, 2019): In my case, I've determined that the problem was that the deauther board package that is required to be installed via the board manager (http://phpsecu.re/esp8266/package_deauther_index.json) includes the ArduinoJson library. On my Windows system, it was found here after installation: %USERPROFILE%\AppData\Local\Arduino15\packages\deauther\hardware\esp8266\2.0.0-deauther\libraries I deleted the ArduinoJson directory located there, and then installed the latest version 5 iteration (in my case, version 5.13.4) via the IDE Library Manager . This will install the ArduinoJson lib in your Documents folder (specifically, %USERPROFILE%\Documents\Arduino\libraries). Oddly, the ArduinoJson library included with the deauther board package appears to be a valid version (5.13.0)... but I still got the upgrade/downgrade error message until it was deleted. Haven't had an issue since.

kerem commented

2026-02-28 00:02:27 +03:00

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@tobozo commented on GitHub (Feb 15, 2019):

@labomb @jumblies thanks for reporting this, the deauther SDK is now bundled with ArduinoJSON 5.13.14

you will need to remove/reinstall the deauther SDK from the boards manager to see the effects though

can you please confirm this action fixed the issue ?

@tobozo commented on GitHub (Feb 15, 2019): @labomb @jumblies thanks for reporting this, the deauther SDK is now [bundled with ArduinoJSON 5.13.14](https://github.com/tobozo/Arduino/blob/deauther/libraries/ArduinoJson/library.properties) you will need to remove/reinstall the deauther SDK from the boards manager to see the effects though can you please confirm this action fixed the issue ?

kerem commented

2026-02-28 00:02:27 +03:00

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@labomb commented on GitHub (Feb 15, 2019):

@tobozo that took care of the problem. I removed the locally installed ArduinoJson lib and removed/reinstalled the deauth board package as requested and it appears that the updated ArduinoJson library that is now bundled works fine... no version errors during build. Thanks for the update.

@labomb commented on GitHub (Feb 15, 2019): @tobozo that took care of the problem. I removed the locally installed ArduinoJson lib and removed/reinstalled the deauth board package as requested and it appears that the updated ArduinoJson library that is now bundled works fine... no version errors during build. Thanks for the update.

kerem commented

2026-02-28 00:02:27 +03:00

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@nc9710 commented on GitHub (Mar 22, 2019):

Followed advice by spacehuhn and resolved issue. I also deleted previously installed libraries which got rid of some warnings I had while compiling. Also, a quick work around (if engaging in the deauther project) is to download the latest bin file and use the ESP8266Flasher.

@nc9710 commented on GitHub (Mar 22, 2019): Followed advice by spacehuhn and resolved issue. I also deleted previously installed libraries which got rid of some warnings I had while compiling. Also, a quick work around (if engaging in the deauther project) is to download the latest bin file and use the ESP8266Flasher.

kerem commented

2026-02-28 00:02:28 +03:00

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@tytower commented on GitHub (Aug 18, 2019):

Importantly for those installing on Arduino , now until they change to ver 6 you can install the Arduinojson version 5 but the error message then will tell you you have 2 Arduinojson libraries and importantly will give you the address of the version 6 it tried to use . Note that directory address down ,go there and delete the whole file first then restart.

@tytower commented on GitHub (Aug 18, 2019): Importantly for those installing on Arduino , now until they change to ver 6 you can install the Arduinojson version 5 but the error message then will tell you you have 2 Arduinojson libraries and importantly will give you the address of the version 6 it tried to use . Note that directory address down ,go there and delete the whole file first then restart.

kerem commented

2026-02-28 00:02:28 +03:00

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@Scooby2001 commented on GitHub (Nov 16, 2019):

Hello there,
i checked every setting. Downgraded ArduinoJson library to version 5.13.4.
I tried everything that was mansioned here but still the same problem:

Arduino: 1.8.10 (Windows 7), Board: "Generic ESP8266 Module, Serial, 160 MHz, 80MHz, DIO, 115200, 4M (3M SPIFFS), nodemcu"

Mehrere Bibliotheken wurden für "EEPROM.h" gefunden
 Benutzt: C:\Users\Abwickler\AppData\Local\Arduino15\packages\deauther\hardware\esp8266\2.0.0-deauther\libraries\EEPROM
Mehrere Bibliotheken wurden für "ArduinoJson.h" gefunden
 Benutzt: C:\Users\Abwickler\Documents\Arduino\libraries\ArduinoJson
 Nicht benutzt: C:\Users\Abwickler\AppData\Local\Arduino15\packages\deauther\hardware\esp8266\2.0.0-deauther\libraries\ArduinoJson
esp8266_deauther:24:17: error: oui.h: No such file or directory

 #include "oui.h"

                 ^

compilation terminated.

exit status 1
oui.h: No such file or directory

Dieser Bericht wäre detaillierter, wenn die Option
"Ausführliche Ausgabe während der Kompilierung"
in Datei -> Voreinstellungen aktiviert wäre.

@Scooby2001 commented on GitHub (Nov 16, 2019): Hello there, i checked every setting. Downgraded ArduinoJson library to version 5.13.4. I tried everything that was mansioned here but still the same problem: ``` Arduino: 1.8.10 (Windows 7), Board: "Generic ESP8266 Module, Serial, 160 MHz, 80MHz, DIO, 115200, 4M (3M SPIFFS), nodemcu" Mehrere Bibliotheken wurden für "EEPROM.h" gefunden Benutzt: C:\Users\Abwickler\AppData\Local\Arduino15\packages\deauther\hardware\esp8266\2.0.0-deauther\libraries\EEPROM Mehrere Bibliotheken wurden für "ArduinoJson.h" gefunden Benutzt: C:\Users\Abwickler\Documents\Arduino\libraries\ArduinoJson Nicht benutzt: C:\Users\Abwickler\AppData\Local\Arduino15\packages\deauther\hardware\esp8266\2.0.0-deauther\libraries\ArduinoJson esp8266_deauther:24:17: error: oui.h: No such file or directory #include "oui.h" ^ compilation terminated. exit status 1 oui.h: No such file or directory Dieser Bericht wäre detaillierter, wenn die Option "Ausführliche Ausgabe während der Kompilierung" in Datei -> Voreinstellungen aktiviert wäre. ```

kerem commented

2026-02-28 00:02:28 +03:00

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@tobozo commented on GitHub (Nov 16, 2019):

you still have two versions, you can safely delete the first folder (Benutzt)

Benutzt: C:\Users\Abwickler\Documents\Arduino\libraries\ArduinoJson

Nicht benutzt: C:\Users\Abwickler\AppData\Local\Arduino15\packages\deauther\hardware\esp8266\2.0.0-deauther\libraries\ArduinoJson

@tobozo commented on GitHub (Nov 16, 2019): you still have two versions, you can safely delete the first folder (Benutzt) Benutzt: C:\Users\Abwickler\Documents\Arduino\libraries\ArduinoJson Nicht benutzt: C:\Users\Abwickler\AppData\Local\Arduino15\packages\deauther\hardware\esp8266\2.0.0-deauther\libraries\ArduinoJson

kerem commented

2026-02-28 00:02:28 +03:00

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@Scooby2001 commented on GitHub (Nov 16, 2019):

Thanks for youre help, tried it but still the same problem...

Arduino: 1.8.10 (Windows 7), Board: "Generic ESP8266 Module, Serial, 160 MHz, 80MHz, DOUT, 115200, 4M (3M SPIFFS), nodemcu"

esp8266_deauther:23:17: error: oui.h: No such file or directory

 #include "oui.h"

                 ^

compilation terminated.

Mehrere Bibliotheken wurden für "ArduinoJson.h" gefunden
 Benutzt: C:\Users\Abwickler\AppData\Local\Arduino15\packages\deauther\hardware\esp8266\2.0.0-deauther\libraries\ArduinoJson
Mehrere Bibliotheken wurden für "EEPROM.h" gefunden
 Benutzt: C:\Users\Abwickler\AppData\Local\Arduino15\packages\deauther\hardware\esp8266\2.0.0-deauther\libraries\EEPROM
exit status 1
oui.h: No such file or directory

Dieser Bericht wäre detaillierter, wenn die Option
"Ausführliche Ausgabe während der Kompilierung"
in Datei -> Voreinstellungen aktiviert wäre.

@Scooby2001 commented on GitHub (Nov 16, 2019): Thanks for youre help, tried it but still the same problem... ``` Arduino: 1.8.10 (Windows 7), Board: "Generic ESP8266 Module, Serial, 160 MHz, 80MHz, DOUT, 115200, 4M (3M SPIFFS), nodemcu" esp8266_deauther:23:17: error: oui.h: No such file or directory #include "oui.h" ^ compilation terminated. Mehrere Bibliotheken wurden für "ArduinoJson.h" gefunden Benutzt: C:\Users\Abwickler\AppData\Local\Arduino15\packages\deauther\hardware\esp8266\2.0.0-deauther\libraries\ArduinoJson Mehrere Bibliotheken wurden für "EEPROM.h" gefunden Benutzt: C:\Users\Abwickler\AppData\Local\Arduino15\packages\deauther\hardware\esp8266\2.0.0-deauther\libraries\EEPROM exit status 1 oui.h: No such file or directory Dieser Bericht wäre detaillierter, wenn die Option "Ausführliche Ausgabe während der Kompilierung" in Datei -> Voreinstellungen aktiviert wäre. ```

kerem commented

2026-02-28 00:02:28 +03:00

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@Jacob12138xieyuan commented on GitHub (Nov 29, 2019):

comment 17,21,22 line, install 5.x, works for me

@Jacob12138xieyuan commented on GitHub (Nov 29, 2019): comment 17,21,22 line, install 5.x, works for me

kerem commented

2026-02-28 00:02:28 +03:00

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@anonymous7cyber commented on GitHub (Mar 17, 2020):

comment 17,21,22 line, install 5.x, works for me

Thanks man!

@anonymous7cyber commented on GitHub (Mar 17, 2020): > comment 17,21,22 line, install 5.x, works for me Thanks man!

kerem commented

2026-02-28 00:02:28 +03:00

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@James0329 commented on GitHub (Aug 25, 2020):

I got a strange problem. friends.

If I don't delete checker all things will stop at version checker.
If I delete the version checker method.
Then install any 5.x ArduinoJson when I upload file to esp8266 will trigger a error like
"invalid initialization of non-const reference of type 'ArduinoJson::JsonArray&' from an rvalue of type 'ArduinoJson::JsonArray'
"
or
"no matching function for call to 'ArduinoJson::DynamicJsonBuffer::DynamicJsonBuffer(int)'
"
this problem location at ssid.cpp file.
"DynamicJsonBuffer jsonBuffer(4000);"
"JsonArray & arr = obj.get(str(SS_JSON_SSIDS)); "
I try 5.0.0|5.0.5|5.1.0|5.4.0 but nothing change.
Need some help (T_T)

@James0329 commented on GitHub (Aug 25, 2020): I got a strange problem. friends. If I don't delete checker all things will stop at version checker. If I delete the version checker method. Then install any 5.x ArduinoJson when I upload file to esp8266 will trigger a error like "invalid initialization of non-const reference of type 'ArduinoJson::JsonArray&' from an rvalue of type 'ArduinoJson::JsonArray' " or "no matching function for call to 'ArduinoJson::DynamicJsonBuffer::DynamicJsonBuffer(int)' " this problem location at ssid.cpp file. "DynamicJsonBuffer jsonBuffer(4000);" "JsonArray & arr = obj.get<JsonArray>(str(SS_JSON_SSIDS)); " I try 5.0.0|5.0.5|5.1.0|5.4.0 but nothing change. Need some help (T_T)

kerem commented

2026-02-28 00:02:28 +03:00

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@5ch4um1 commented on GitHub (Jan 3, 2021):

had this issue yesterday, but somehow it went away, i tried a few versions of ArduinoJson, to no avail, but today it works, not sure if it was the logout (restart in my case) ? I also deleted the repository and cloned it again, but i guess this shouldn't make a difference?

@5ch4um1 commented on GitHub (Jan 3, 2021): had this issue yesterday, but somehow it went away, i tried a few versions of ArduinoJson, to no avail, but today it works, not sure if it was the logout (restart in my case) ? I also deleted the repository and cloned it again, but i guess this shouldn't make a difference?

kerem commented

2026-02-28 00:02:28 +03:00

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@nvinh5064-ctrl commented on GitHub (Jan 14, 2026):

Having an error when compiling, ArduinoJSON is v5. Please help.

WARNING: Category '' in library ArduinoJson is not valid. Setting to 'Uncategorized'
esp8266_deauther:21:2: error: #error Please upgrade/downgrade ArduinoJSON library to version 5!

 #error Please upgrade/downgrade ArduinoJSON library to version 5!

  ^

esp8266_deauther:24:17: error: oui.h: No such file or directory

 #include "oui.h"

                 ^

compilation terminated.

exit status 1
#error Please upgrade/downgrade ArduinoJSON library to version 5!

@nvinh5064-ctrl commented on GitHub (Jan 14, 2026): > Having an error when compiling, ArduinoJSON is v5. Please help. > > ``` > WARNING: Category '' in library ArduinoJson is not valid. Setting to 'Uncategorized' > esp8266_deauther:21:2: error: #error Please upgrade/downgrade ArduinoJSON library to version 5! > > #error Please upgrade/downgrade ArduinoJSON library to version 5! > > ^ > > esp8266_deauther:24:17: error: oui.h: No such file or directory > > #include "oui.h" > > ^ > > compilation terminated. > > exit status 1 > #error Please upgrade/downgrade ArduinoJSON library to version 5! > ```

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[GH-ISSUE #975] ERROR: Please upgrade/downgrade ArduinoJSON #437