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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Loading runtime in blender on macOS 15.1 causes `MissingMethodException`","articleBody":"### Environment\r\n\r\n-   Pythonnet version: 3.0.4\r\n-   Python version: 3.11.7\r\n-   Operating System: macOS 15.1 (24B83), ARM64\r\n-   .NET Runtime: 8.0\r\n\r\n---\r\n\r\n### Details\r\n\r\nI am using pythonnet for a blender extension, and for the most part, it works great!\r\n\r\nHowever, recently a user reported that it does not run on their macOS system, which throws following error upon trying to load `coreclr`:\r\n`System.MissingMethodException: Failed to load symbol Py_Main: dlsym(RTLD_DEFAULT, Py_Main): symbol not found`\r\n\r\nThe error does not occur when attempting to do so using the python executable shipped with blender directly. \r\nIt only happens when running from within blender itself.\r\n\r\n---\r\n\r\n### Minimal Reproduction\r\n\r\n1. Get a device with macOS 15.1 and ARM64 architecture\r\n2. download blender 4.2\r\n3. Create the files `script.py` and `runtimeconfig.json` in the same directory with the contents pasted below\r\n4. Run blender with the commandline argument `-P path/to/script.py`\r\n\r\n(note: the crash occurs without `runtimeconfig.json` as well, but i still included it for good measure)\r\n\r\n#### script.py\r\n```python\r\ndef run():\r\n    try:\r\n        import pythonnet\r\n    except ModuleNotFoundError:\r\n        import pip\r\n        pip.main([\"install\", \"pythonnet\"])\r\n\r\n        try:\r\n            import pythonnet\r\n        except ModuleNotFoundError:\r\n            print(\"Could not install python.net, please try running blender with admin rights or run a portable instance of blender in a directory with write access\")\r\n            return\r\n\r\n    import pathlib\r\n    runtime_config_path = pathlib.Path(__file__).parent / \"runtimeconfig.json\"\r\n    pythonnet.load(\"coreclr\", runtime_config=runtime_config_path)\r\n\r\n    from System import Console\r\n    Console.WriteLine(\"Pythonnet successfully loaded!\")\r\n\r\nrun()\r\n```\r\n\r\n#### runtimeconfig.json\r\n```json\r\n{\r\n  \"runtimeOptions\": {\r\n    \"tfm\": \"net8.0\",\r\n    \"framework\": {\r\n      \"name\": \"Microsoft.NETCore.App\",\r\n      \"version\": \"8.0.0\"\r\n    },\r\n    \"configProperties\": {\r\n      \"System.Reflection.Metadata.MetadataUpdater.IsSupported\": false,\r\n      \"System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization\": false\r\n    }\r\n  }\r\n}\r\n```\r\n\r\n---\r\n\r\n### Console output / Stacktrace\r\n\r\n```python\r\nFailed to initialize pythonnet: System.TypeInitializationException: The type initializer for 'Delegates' threw an exception.\r\n ---\u003e Python.Runtime.BadPythonDllException: Runtime.PythonDLL was not set or does not point to a supported Python runtime DLL. See https://github.com/pythonnet/pythonnet#embedding-python-in-net\r\n ---\u003e System.MissingMethodException: Failed to load symbol Py_Main: dlsym(RTLD_DEFAULT, Py_Main): symbol not found\r\n   at Python.Runtime.Platform.PosixLoader.GetFunction(IntPtr dllHandle, String name) in /home/benedikt/dev/pythonnet/dist/.tmpXppz4v/pythonnet-3.0.4/src/runtime/Native/LibraryLoader.cs:line 85\r\n   at Python.Runtime.Runtime.Delegates.GetFunctionByName(String functionName, IntPtr libraryHandle) in /home/benedikt/dev/pythonnet/dist/.tmpXppz4v/pythonnet-3.0.4/src/runtime/Runtime.Delegates.cs:line 296\r\n   --- End of inner exception stack trace ---\r\n   at Python.Runtime.Runtime.Delegates.GetFunctionByName(String functionName, IntPtr libraryHandle) in /home/benedikt/dev/pythonnet/dist/.tmpXppz4v/pythonnet-3.0.4/src/runtime/Runtime.Delegates.cs:line 300\r\n   at Python.Runtime.Runtime.Delegates..cctor() in /home/benedikt/dev/pythonnet/dist/.tmpXppz4v/pythonnet-3.0.4/src/runtime/Runtime.Delegates.cs:line 38\r\n   --- End of inner exception stack trace ---\r\n   at Python.Runtime.Runtime.Delegates.get_PyGILState_Ensure() in /home/benedikt/dev/pythonnet/dist/.tmpXppz4v/pythonnet-3.0.4/src/runtime/Runtime.Delegates.cs:line 319\r\n   at Python.Runtime.Runtime.PyGILState_Ensure() in /home/benedikt/dev/pythonnet/dist/.tmpXppz4v/pythonnet-3.0.4/src/runtime/Runtime.cs:line 712\r\n   at Python.Runtime.PythonEngine.AcquireLock() in /home/benedikt/dev/pythonnet/dist/.tmpXppz4v/pythonnet-3.0.4/src/runtime/PythonEngine.cs:line 479\r\n   at Python.Runtime.Py.GILState..ctor() in /home/benedikt/dev/pythonnet/dist/.tmpXppz4v/pythonnet-3.0.4/src/runtime/Py.cs:line 27\r\n   at Python.Runtime.Py.GIL() in /home/benedikt/dev/pythonnet/dist/.tmpXppz4v/pythonnet-3.0.4/src/runtime/Py.cs:line 13\r\n   at Python.Runtime.Loader.Initialize(IntPtr data, Int32 size) in /home/benedikt/dev/pythonnet/dist/.tmpXppz4v/pythonnet-3.0.4/src/runtime/Loader.cs:line 26\r\n   at Python.Runtime.Runtime.Delegates.get_PyGILState_Ensure() in /home/benedikt/dev/pythonnet/dist/.tmpXppz4v/pythonnet-3.0.4/src/runtime/Runtime.Delegates.cs:line 319\r\n   at Python.Runtime.Runtime.PyGILState_Ensure() in /home/benedikt/dev/pythonnet/dist/.tmpXppz4v/pythonnet-3.0.4/src/runtime/Runtime.cs:line 712\r\n   at Python.Runtime.PythonEngine.AcquireLock() in /home/benedikt/dev/pythonnet/dist/.tmpXppz4v/pythonnet-3.0.4/src/runtime/PythonEngine.cs:line 479\r\n   at Python.Runtime.Py.GILState..ctor() in /home/benedikt/dev/pythonnet/dist/.tmpXppz4v/pythonnet-3.0.4/src/runtime/Py.cs:line 27\r\n   at Python.Runtime.Py.GIL() in /home/benedikt/dev/pythonnet/dist/.tmpXppz4v/pythonnet-3.0.4/src/runtime/Py.cs:line 13\r\n   at Python.Runtime.Loader.Initialize(IntPtr data, Int32 size) in /home/benedikt/dev/pythonnet/dist/.tmpXppz4v/pythonnet-3.0.4/src/runtime/Loader.cs:line 26Traceback (most recent call last):\r\n  File \"/Users/user/Documents/Test/pythonnet_issue.py\", line 22, in \u003cmodule\u003e\r\n    run()\r\n  File \"/Users/user/Documents/Test/pythonnet_issue.py\", line 17, in run\r\n    pythonnet.load(\"coreclr\", runtime_config=config)\r\n  File \"/Users/user/Library/Application Support/Blender/4.2/extensions/.local/lib/python3.11/site-packages/pythonnet/__init__.py\", line 146, in load\r\n    raise RuntimeError(\"Failed to initialize Python.Runtime.dll\")\r\nRuntimeError: Failed to initialize Python.Runtime.dll\r\n```\r\n\r\nNote: \r\nHere, pythonnet is located in blenders extension folder, which ships pythonnet 3.0.4 via wheels. \r\nRemoving it does unfortunately not change the result.","author":{"url":"https://github.com/Justin113D","@type":"Person","name":"Justin113D"},"datePublished":"2024-11-07T22:45:14.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/2503/pythonnet/issues/2503"}