[GH-ISSUE #58] UI not connecting to ACE STEP 1.5 #54

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opened 2026-02-26 21:31:04 +03:00 by kerem · 0 comments
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Originally created by @TanvirHafiz on GitHub (Feb 22, 2026).
Original GitHub issue: https://github.com/fspecii/ace-step-ui/issues/58

I donwloaded the portable windows version of ace step 1.5 which runs perfectly in gradio mode. then i ran it in API mode (start_api_server.bat) but ace step UI does not connect. even the steps mentioned for connecting to windows portable (cd C:\ACE-Step-1.5
python_embeded\python -m acestep --port 8001 --enable-api --backend pt --server-name 127.0.0.1) also does not connect. what am i doing wrong?

note that the UI loads, but it cannot connect to the ace steo server running at 8001 when i start API mode. the API is available at http://127.0.0.1:8001 according to ace step 1.5 CLI.

the message i get from UI is "Generation failed. Please try again.: spawn F:\ace-step-ui\ACE-Step-1.5\env\Scripts\python.exe ENOENT"

the message I get from API CLI of ace step is "INFO: 127.0.0.1:64117 - "GET /gradio_api/info HTTP/1.1" 404 Not Found"

another error i get is

Job job_1771737007291_nfuq5o6: Using Python spawn (Gradio not available) {
prompt: 'christmas melody',
lyricsPreview: '',
duration: undefined,
batchSize: 1
}
Job job_1771737007291_nfuq5o6: Generation failed Error: spawn F:\ace-step-ui\ACE-Step-1.5\env\Scripts\python.exe ENOENT
at processGenerationViaPython (F:\ace-step-ui\server\src\services\acestep.ts:673:13)
at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
at async processGeneration (F:\ace-step-ui\server\src\services\acestep.ts:464:3)
at async processQueue (F:\ace-step-ui\server\src\services\acestep.ts:389:9)

Originally created by @TanvirHafiz on GitHub (Feb 22, 2026). Original GitHub issue: https://github.com/fspecii/ace-step-ui/issues/58 I donwloaded the portable windows version of ace step 1.5 which runs perfectly in gradio mode. then i ran it in API mode (start_api_server.bat) but ace step UI does not connect. even the steps mentioned for connecting to windows portable (cd C:\ACE-Step-1.5 python_embeded\python -m acestep --port 8001 --enable-api --backend pt --server-name 127.0.0.1) also does not connect. what am i doing wrong? note that the UI loads, but it cannot connect to the ace steo server running at 8001 when i start API mode. the API is available at http://127.0.0.1:8001 according to ace step 1.5 CLI. the message i get from UI is "Generation failed. Please try again.: spawn F:\ace-step-ui\ACE-Step-1.5\env\Scripts\python.exe ENOENT" the message I get from API CLI of ace step is "INFO: 127.0.0.1:64117 - "GET /gradio_api/info HTTP/1.1" 404 Not Found" another error i get is Job job_1771737007291_nfuq5o6: Using Python spawn (Gradio not available) { prompt: 'christmas melody', lyricsPreview: '', duration: undefined, batchSize: 1 } Job job_1771737007291_nfuq5o6: Generation failed Error: spawn F:\ace-step-ui\ACE-Step-1.5\env\Scripts\python.exe ENOENT at processGenerationViaPython (F:\ace-step-ui\server\src\services\acestep.ts:673:13) at process.processTicksAndRejections (node:internal/process/task_queues:105:5) at async processGeneration (F:\ace-step-ui\server\src\services\acestep.ts:464:3) at async processQueue (F:\ace-step-ui\server\src\services\acestep.ts:389:9)
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