Regression: bpy.utils.register_class() "can't run in readonly state" error when run from Text Editor #112461

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opened 2023-09-17 02:54:05 +02:00 by Thomas Barlow · 7 comments

Thomas Barlow commented

2023-09-17 02:54:05 +02:00

Member

System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 536.40

Blender Version
Broken: version: 4.0.0 Alpha, branch: main, commit date: 2023-09-10 22:17, hash: fca8df9415b1
Worked: 4.0.0 Alpha, branch: main, commit date: 2023-09-01 21:43, hash de09bdb510a0

Short description of error
Running bpy.utils.register_class() from the Text Editor raises RuntimeError: register_class(...): can't run in readonly state 'TestOp'.

Running from the Python Console instead has no issues.

Exact steps for others to reproduce the error
Run in the Text Editor (or use and run one of the many Python Templates in the Text Editor that also use bpy.utils.register_class()):

import bpy

class TestOp(bpy.types.Operator):
    bl_label = "Test Op"
    bl_idname = "test.op"

    def execute(self, context):
        return {'CANCELLED'}

bpy.utils.register_class(TestOp)

**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 536.40 **Blender Version** Broken: version: 4.0.0 Alpha, branch: main, commit date: 2023-09-10 22:17, hash: `fca8df9415b1` Worked: 4.0.0 Alpha, branch: main, commit date: 2023-09-01 21:43, hash `de09bdb510a0` **Short description of error** Running `bpy.utils.register_class()` from the Text Editor raises `RuntimeError: register_class(...): can't run in readonly state 'TestOp'`. Running from the Python Console instead has no issues. **Exact steps for others to reproduce the error** Run in the Text Editor (or use and run one of the many Python Templates in the Text Editor that also use `bpy.utils.register_class()`): ```py import bpy class TestOp(bpy.types.Operator): bl_label = "Test Op" bl_idname = "test.op" def execute(self, context): return {'CANCELLED'} bpy.utils.register_class(TestOp) ```

Thomas Barlow added the

labels 2023-09-17 02:54:06 +02:00

Iliya Katushenock changed title from ~~bpy.utils.register_class() "can't run in readonly state" error when run from Text Editor~~ to Regression: bpy.utils.register_class() "can't run in readonly state" error when run from Text Editor

2023-09-17 10:30:13 +02:00

Iliya Katushenock commented

2023-09-17 10:32:16 +02:00

Member

I can not reproduce this.

I can not reproduce this.

Iliya Katushenock added the

label 2023-09-17 10:32:22 +02:00

Thomas Barlow commented

2023-09-17 14:26:02 +02:00

Author

Member

Hmm, now I can't reproduce it either. I've tried retracing my steps from the console log last night, I just did a few FBX exports with different material setups and imports to see what the exported results looked like, but no luck there either.

Hmm, now I can't reproduce it either. I've tried retracing my steps from the console log last night, I just did a few FBX exports with different material setups and imports to see what the exported results looked like, but no luck there either.

YimingWu added

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and removed

labels 2023-09-18 05:05:49 +02:00

Pratik Borhade commented

2023-10-20 11:36:52 +02:00

Member

Hi, Any updates?

Hi, Any updates?

Thomas Barlow commented

2023-10-20 23:12:14 +02:00

Author

Member

It hasn't occurred since and I couldn't see anything clearly wrong from the relevant C code. Maybe it was an unlucky hardware bitflip.

It hasn't occurred since and I couldn't see anything clearly wrong from the relevant C code. Maybe it was an unlucky hardware bitflip.

Pratik Borhade commented

2023-10-23 11:04:24 +02:00

Member

Thanks, I think we can close this report for now. If you find anything relevant, feel free to reopen 🙂

Thanks, I think we can close this report for now. If you find anything relevant, feel free to reopen 🙂

Pratik Borhade closed this issue

2023-10-23 11:04:27 +02:00

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labels 2023-10-23 11:04:28 +02:00

michael campbell commented

2023-11-03 15:34:00 +01:00

I've experienced this today using 4.1 last nights build. Every installed addon's unregister function threw the can't run in read only mode.

I've experienced this today using 4.1 last nights build. Every installed addon's unregister function threw the can't run in read only mode.

Thomas Barlow referenced this issue

2024-02-20 20:42:43 +01:00

Python: Can't set collection visibility from Text Editor #118527

Jeff Knox commented

2024-04-10 03:38:06 +02:00

I had this same error and found that a modal operator was started by an addon, the operator returned {'RUNNING_MODAL'}, but then never finished. So the modal operator was "stuck" running forever, until I quit Blender. While it is running, no classes can be registered with Blender through bpy.utils.register_class.

I don't completely understand why it got stuck because one way to exit the modal operator was to cancel the render. But I hit ESC, started a new render, etc. and nothing would end the modal operator. I don't know if the tenacity of the modality is related to this issue (112461), or just a bug in the addon code.

I almost had a consistent repro working to post here, went out for a walk, came back and now it won't repro at all... Entirely frustrating!

I had this same error and found that a modal operator was started by an addon, the operator returned `{'RUNNING_MODAL'}`, but then never finished. So the modal operator was "stuck" running forever, until I quit Blender. While it is running, no classes can be registered with Blender through `bpy.utils.register_class`. I don't completely understand why it got stuck because one way to exit the modal operator was to cancel the render. But I hit `ESC`, started a new render, etc. and nothing would end the modal operator. I don't know if the tenacity of the modality is related to this issue (112461), or just a bug in the addon code. I almost had a consistent repro working to post here, went out for a walk, came back and now it won't repro at all... Entirely frustrating!

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