dify - 💡(How to fix) Fix Plugin unable to add model [9 comments, 3 participants]

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Dify version

1.13.3

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

Firstly, package the VLLM plugin offline, install the plugin locally successfully, and then add the Qwen3.5 model to report an Internal Server Error

✔️ Expected Behavior

The model is installed

❌ Actual Behavior

2026-04-21 05:48:56.392 ERROR [Dummy-138] [base.py:305] 34f0b649a92b547fbc97291ed2ff37a1 - Error in stream response for plugin {'code': -500, 'message': '{"message":"no proper instance","error_type":"PluginDaemonInternalServerError","args":null}', 'data': None} 2026-04-21 05:48:56.393 ERROR [Dummy-138] [app.py:875] 34f0b649a92b547fbc97291ed2ff37a1 - Exception on /console/api/workspaces/current/model-providers/yangyaofei/vllm/vllm/models/credentials [POST] Traceback (most recent call last): File "/app/api/.venv/lib/python3.12/site-packages/flask/app.py", line 917, in full_dispatch_request rv = self.dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^ File "/app/api/.venv/lib/python3.12/site-packages/flask/app.py", line 902, in dispatch_request return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) # type: ignore[no-any-return] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/app/api/.venv/lib/python3.12/site-packages/flask_restx/api.py", line 404, in wrapper resp = resource(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^ File "/app/api/.venv/lib/python3.12/site-packages/flask/views.py", line 110, in view return current_app.ensure_sync(self.dispatch_request)(**kwargs) # type: ignore[no-any-return] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/app/api/.venv/lib/python3.12/site-packages/flask_restx/resource.py", line 41, in dispatch_request resp = meth(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^ File "/app/api/controllers/console/wraps.py", line 227, in decorated return view(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^ File "/app/api/libs/login.py", line 97, in decorated_view return current_app.ensure_sync(func)(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/app/api/controllers/console/wraps.py", line 337, in decorated_function return f(*args, **kwargs) ^^^^^^^^^^^^^^^^^^ File "/app/api/controllers/console/wraps.py", line 48, in decorated return view(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^ File "/app/api/controllers/console/workspace/models.py", line 322, in post model_provider_service.create_model_credential( File "/app/api/services/model_provider_service.py", line 282, in create_model_credential provider_configuration.create_custom_model_credential( File "/app/api/core/entities/provider_configuration.py", line 944, in create_custom_model_credential credentials = self.validate_custom_model_credentials( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/app/api/core/entities/provider_configuration.py", line 917, in validate_custom_model_credentials return _validate(session) ^^^^^^^^^^^^^^^^^^ File "/app/api/core/entities/provider_configuration.py", line 906, in _validate validated_credentials = model_provider_factory.model_credentials_validate( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/app/api/dify_graph/model_runtime/model_providers/model_provider_factory.py", line 165, in model_credentials_validate self.plugin_model_manager.validate_model_credentials( File "/app/api/core/plugin/impl/model.py", line 137, in validate_model_credentials for resp in response: ^^^^^^^^ File "/app/api/core/plugin/impl/base.py", line 306, in _request_with_plugin_daemon_response_stream self._handle_plugin_daemon_error(error.error_type, error.message) File "/app/api/core/plugin/impl/base.py", line 349, in _handle_plugin_daemon_error raise PluginDaemonInternalServerError(description=message) core.plugin.impl.exc.PluginDaemonInternalServerError: req_id: bf0b212ab0 PluginDaemonInternalServerError: no proper instance 2026-04-21 05:49:04.916 WARNING [Dummy-139] [version.py:61] 4d80edad4b3050d28aa02e76365311c8 - Check update version error: [Errno 101] Network is unreachabl