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[GH-ISSUE #1876] Uncaught Error: Class "Monolog\Logger" not found #799

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opened 2026-03-04 02:18:08 +03:00 by kerem · 9 comments

kerem commented

2026-03-04 02:18:08 +03:00

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Originally created by @Justman100 on GitHub (Apr 1, 2024).
Original GitHub issue: https://github.com/Seldaek/monolog/issues/1876

Hi, if i use Composer, this comes:

PHP Fatal error: Uncaught Error: Class "Monolog\Logger" not found in /home/mt/vendor/monolog/monolog/src/Monolog/Handler/AbstractHandler.php:60
Stack trace:

I use the version 3.5.0

Originally created by @Justman100 on GitHub (Apr 1, 2024). Original GitHub issue: https://github.com/Seldaek/monolog/issues/1876 Hi, if i use Composer, this comes: > PHP Fatal error: Uncaught Error: Class "Monolog\Logger" not found in /home/mt/vendor/monolog/monolog/src/Monolog/Handler/AbstractHandler.php:60 Stack trace: I use the version 3.5.0

kerem

2026-03-04 02:18:08 +03:00

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kerem commented

2026-03-04 02:18:09 +03:00

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@stof commented on GitHub (Apr 1, 2024):

This error does not make any sense. The Monolog\Logger class exists in Monolog. Make sure you don't have a corrupted vendor/monolog/monolog folder (you can use composer reinstall monolog/monolog)

@stof commented on GitHub (Apr 1, 2024): This error does not make any sense. The `Monolog\Logger` class exists in Monolog. Make sure you don't have a corrupted `vendor/monolog/monolog` folder (you can use `composer reinstall monolog/monolog`)

kerem commented

2026-03-04 02:18:09 +03:00

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@Justman100 commented on GitHub (Apr 1, 2024):

This error does not make any sense. The Monolog\Logger class exists in Monolog. Make sure you don't have a corrupted vendor/monolog/monolog folder (you can use composer reinstall monolog/monolog)

Still comes

@Justman100 commented on GitHub (Apr 1, 2024): > This error does not make any sense. The `Monolog\Logger` class exists in Monolog. Make sure you don't have a corrupted `vendor/monolog/monolog` folder (you can use `composer reinstall monolog/monolog`) Still comes

kerem commented

2026-03-04 02:18:09 +03:00

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@Justman100 commented on GitHub (Apr 1, 2024):

It occurs a another error too

PHP Fatal error: Declaration of Monolog\Logger::emergency(Stringable|string $message, array $context = []): void must be compatible with PsrExt\Log\LoggerInterface::emergency($message, array $context = []) in /home/mt/vendor/monolog/monolog/src/Monolog/Logger.php on line 681

@Justman100 commented on GitHub (Apr 1, 2024): It occurs a another error too > PHP Fatal error: Declaration of Monolog\Logger::emergency(Stringable|string $message, array $context = []): void must be compatible with PsrExt\Log\LoggerInterface::emergency($message, array $context = []) in /home/mt/vendor/monolog/monolog/src/Monolog/Logger.php on line 681

kerem commented

2026-03-04 02:18:09 +03:00

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@stof commented on GitHub (Apr 2, 2024):

Do you have the psr PHP extension installed ? If yes, please remove it. This extension is totally broken because it does not account for the fact that all psr/* packages have multiple versions. The working way is to rely on the userland implementation of the PSR interfaces which are managed by composer.

@stof commented on GitHub (Apr 2, 2024): Do you have the `psr` PHP extension installed ? If yes, please remove it. This extension is totally broken because it does not account for the fact that all `psr/*` packages have multiple versions. The working way is to rely on the userland implementation of the PSR interfaces which are managed by composer.

kerem commented

2026-03-04 02:18:09 +03:00

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@Justman100 commented on GitHub (Apr 2, 2024):

Do you have the psr PHP extension installed ? If yes, please remove it. This extension is totally broken because it does not account for the fact that all psr/* packages have multiple versions. The working way is to rely on the userland implementation of the PSR interfaces which are managed by composer.

Hmm, removed! But still comes

@Justman100 commented on GitHub (Apr 2, 2024): > Do you have the `psr` PHP extension installed ? If yes, please remove it. This extension is totally broken because it does not account for the fact that all `psr/*` packages have multiple versions. The working way is to rely on the userland implementation of the PSR interfaces which are managed by composer. Hmm, removed! But still comes

kerem commented

2026-03-04 02:18:09 +03:00

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@Justman100 commented on GitHub (May 3, 2024):

@Seldaek

@Justman100 commented on GitHub (May 3, 2024): @Seldaek

kerem commented

2026-03-04 02:18:09 +03:00

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@Seldaek commented on GitHub (May 3, 2024):

@Justman100 yeah sorry i have no idea.. this seems to be an environment issue.

@Seldaek commented on GitHub (May 3, 2024): @Justman100 yeah sorry i have no idea.. this seems to be an environment issue.

kerem commented

2026-03-04 02:18:09 +03:00

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@keshavvin commented on GitHub (Dec 12, 2024):

Fatal error: Uncaught Error: Class "Monolog\Logger" not found in C:\wamp\www\donor\modules\Vtiger\helpers\Logger.php:83 Stack trace: #0 C:\wamp\www\donor\include\logging.php(24): require_once() #1 C:\wamp\www\donor\include\database\PearDatabase.php(16): require_once('C:\wamp\www\don...') #2 C:\wamp\www\donor\include\utils\UserInfoUtil.php(12): require_once('C:\wamp\www\don...') #3 C:\wamp\www\donor\vtlib\Vtiger\Access.php(10): include_once('C:\wamp\www\don...') #4 C:\wamp\www\donor\vtlib\Vtiger\ModuleBasic.php(10): include_once('C:\wamp\www\don...') #5 C:\wamp\www\donor\vtlib\Vtiger\Module.php(12): include_once('C:\wamp\www\don...') #6 C:\wamp\www\donor\prospect.php(3): include_once('C:\wamp\www\don...') #7 {main} thrown in C:\wamp\www\donor\modules\Vtiger\helpers\Logger.php on line 83
how to resolve this error in vtiger v- 8

@keshavvin commented on GitHub (Dec 12, 2024): Fatal error: Uncaught Error: Class "Monolog\Logger" not found in C:\wamp\www\donor\modules\Vtiger\helpers\Logger.php:83 Stack trace: #0 C:\wamp\www\donor\include\logging.php(24): require_once() #1 C:\wamp\www\donor\include\database\PearDatabase.php(16): require_once('C:\\wamp\\www\\don...') #2 C:\wamp\www\donor\include\utils\UserInfoUtil.php(12): require_once('C:\\wamp\\www\\don...') #3 C:\wamp\www\donor\vtlib\Vtiger\Access.php(10): include_once('C:\\wamp\\www\\don...') #4 C:\wamp\www\donor\vtlib\Vtiger\ModuleBasic.php(10): include_once('C:\\wamp\\www\\don...') #5 C:\wamp\www\donor\vtlib\Vtiger\Module.php(12): include_once('C:\\wamp\\www\\don...') #6 C:\wamp\www\donor\prospect.php(3): include_once('C:\\wamp\\www\\don...') #7 {main} thrown in C:\wamp\www\donor\modules\Vtiger\helpers\Logger.php on line 83 how to resolve this error in vtiger v- 8

kerem commented

2026-03-04 02:18:09 +03:00

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@bhuyInfinitalk279 commented on GitHub (Jan 31, 2025):

make sure you imported this code require 'vendor/autoload.php';

@bhuyInfinitalk279 commented on GitHub (Jan 31, 2025): make sure you imported this code `require 'vendor/autoload.php';`