Cannot execute because a node is missing the class_type property.: Node ID '#90'

[Hollyoxx]

Custom Node Testing

• I have tried disabling custom nodes and the issue persists (see how to disable custom nodes if you need help)

Your question

ComfyUI Error Report

Error Details

• Node ID: N/A
• Node Type: N/A
• Exception Type: Ошибка выполнения запроса
• Exception Message: Cannot execute because a node is missing the class_type property.: Node ID '[Feature Request] Several ideas #90'

Stack Trace

Error: Prompt execution failed
    at ComfyApi.queuePrompt (http://127.0.0.1:8002/assets/index-azSeANjR.js:4:5485)
    at async PromptService.api.queuePrompt (http://127.0.0.1:8002/rgthree/common/prompt_service.js:88:28)
    at async ComfyApp.queuePrompt (http://127.0.0.1:8002/assets/index-azSeANjR.js:253:17414)
    at async app.queuePrompt (http://127.0.0.1:8002/extensions/rgthree-comfy/rgthree.js:478:24)
    at async Proxy.function (http://127.0.0.1:8002/assets/GraphView-CyYDa8uS.js:15:72634)
    at async http://127.0.0.1:8002/assets/index-azSeANjR.js:62:267474
    at async Proxy.execute (http://127.0.0.1:8002/assets/index-azSeANjR.js:62:286967)
    at async queuePrompt (http://127.0.0.1:8002/assets/ComfyQueueButton-BH3dqSji.js:1:3164)

System Information

• ComfyUI Version: 0.8.2
• Arguments: C:\Conf\ComfyUI\resources\ComfyUI\main.py --user-directory C:\Conf2\user --input-directory C:\Conf2\input --output-directory C:\Conf2\output --front-end-root C:\Conf\ComfyUI\resources\ComfyUI\web_custom_versions\desktop_app --base-directory C:\Conf2 --extra-model-paths-config C:\Users\User\AppData\Roaming\ComfyUI\extra_models_config.yaml --log-stdout --listen 127.0.0.1 --port 8002 --enable-manager
• OS: win32
• Python Version: 3.12.11 (main, Aug 18 2025, 19:17:54) [MSC v.1944 64 bit (AMD64)]
• Embedded Python: false
• PyTorch Version: 2.9.1+cu130

Devices

• Name: cuda:0 NVIDIA GeForce RTX 5070 Ti : cudaMallocAsync
  • Type: cuda
  • VRAM Total: 17094475776
  • VRAM Free: 15645802496
  • Torch VRAM Total: 0
  • Torch VRAM Free: 0

Logs

2026-01-17T18:37:05.874520 - Adding extra search path custom_nodes C:\Conf2\custom_nodes
2026-01-17T18:37:05.874520 - Adding extra search path download_model_base C:\Conf2\models
2026-01-17T18:37:05.874520 - Adding extra search path custom_nodes C:\Conf\ComfyUI\resources\ComfyUI\custom_nodes
2026-01-17T18:37:05.874520 - Setting output directory to: C:\Conf2\output
2026-01-17T18:37:05.874520 - Setting input directory to: C:\Conf2\input
2026-01-17T18:37:05.874520 - Setting user directory to: C:\Conf2\user
2026-01-17T18:37:06.001255 - [START] Security scan2026-01-17T18:37:06.001255 - 
2026-01-17T18:37:06.813786 - [DONE] Security scan2026-01-17T18:37:06.813786 - 
2026-01-17T18:37:06.813786 - ** ComfyUI startup time:2026-01-17T18:37:06.813786 -  2026-01-17T18:37:06.813786 - 2026-01-17 18:37:06.8132026-01-17T18:37:06.813786 - 
2026-01-17T18:37:06.813786 - ** Platform:2026-01-17T18:37:06.813786 -  2026-01-17T18:37:06.813786 - Windows2026-01-17T18:37:06.813786 - 
2026-01-17T18:37:06.813786 - ** Python version:2026-01-17T18:37:06.813786 -  2026-01-17T18:37:06.813786 - 3.12.11 (main, Aug 18 2025, 19:17:54) [MSC v.1944 64 bit (AMD64)]2026-01-17T18:37:06.813786 - 
2026-01-17T18:37:06.813786 - ** Python executable:2026-01-17T18:37:06.813786 -  2026-01-17T18:37:06.813786 - C:\Conf2\.venv\Scripts\python.exe2026-01-17T18:37:06.813786 - 
2026-01-17T18:37:06.813786 - ** ComfyUI Path:2026-01-17T18:37:06.813786 -  2026-01-17T18:37:06.813786 - C:\Conf\ComfyUI\resources\ComfyUI2026-01-17T18:37:06.813786 - 
2026-01-17T18:37:06.813786 - ** ComfyUI Base Folder Path:2026-01-17T18:37:06.813786 -  2026-01-17T18:37:06.813786 - C:\Conf\ComfyUI\resources\ComfyUI2026-01-17T18:37:06.813786 - 
2026-01-17T18:37:06.813786 - ** User directory:2026-01-17T18:37:06.813786 -  2026-01-17T18:37:06.813786 - C:\Conf2\user2026-01-17T18:37:06.813786 - 
2026-01-17T18:37:06.813786 - ** ComfyUI-Manager config path:2026-01-17T18:37:06.813786 -  2026-01-17T18:37:06.813786 - C:\Conf2\user\__manager\config.ini2026-01-17T18:37:06.813786 - 
2026-01-17T18:37:06.813786 - ** Log path:2026-01-17T18:37:06.813786 -  2026-01-17T18:37:06.813786 - C:\Conf2\user\comfyui.log2026-01-17T18:37:06.813786 - 
2026-01-17T18:37:07.502967 - [ComfyUI-Manager] Skipped fixing the 'comfyui-frontend-package' dependency because the ComfyUI is outdated.
2026-01-17T18:37:07.502967 - [PRE] ComfyUI-Manager
2026-01-17T18:37:08.548091 - Checkpoint files will always be loaded safely.
2026-01-17T18:37:08.686997 - Total VRAM 16303 MB, total RAM 31861 MB
2026-01-17T18:37:08.686997 - pytorch version: 2.9.1+cu130
2026-01-17T18:37:08.686997 - Set vram state to: NORMAL_VRAM
2026-01-17T18:37:08.686997 - Device: cuda:0 NVIDIA GeForce RTX 5070 Ti : cudaMallocAsync
2026-01-17T18:37:08.700915 - Using async weight offloading with 2 streams
2026-01-17T18:37:08.700915 - Enabled pinned memory 14337.0
2026-01-17T18:37:08.707758 - working around nvidia conv3d memory bug.
2026-01-17T18:37:09.409040 - Found comfy_kitchen backend cuda: {'available': True, 'disabled': False, 'unavailable_reason': None, 'capabilities': ['apply_rope', 'apply_rope1', 'dequantize_nvfp4', 'dequantize_per_tensor_fp8', 'quantize_nvfp4', 'quantize_per_tensor_fp8', 'scaled_mm_nvfp4']}
2026-01-17T18:37:09.409040 - Found comfy_kitchen backend eager: {'available': True, 'disabled': False, 'unavailable_reason': None, 'capabilities': ['apply_rope', 'apply_rope1', 'dequantize_nvfp4', 'dequantize_per_tensor_fp8', 'quantize_nvfp4', 'quantize_per_tensor_fp8', 'scaled_mm_nvfp4']}
2026-01-17T18:37:09.409261 - Found comfy_kitchen backend triton: {'available': False, 'disabled': True, 'unavailable_reason': "ImportError: No module named 'triton'", 'capabilities': []}
2026-01-17T18:37:09.575985 - Using pytorch attention
2026-01-17T18:37:10.881393 - Python version: 3.12.11 (main, Aug 18 2025, 19:17:54) [MSC v.1944 64 bit (AMD64)]
2026-01-17T18:37:10.881393 - ComfyUI version: 0.8.2
2026-01-17T18:37:10.909312 - [Prompt Server] web root: C:\Conf\ComfyUI\resources\ComfyUI\web_custom_versions\desktop_app
2026-01-17T18:37:10.909312 - [START] ComfyUI-Manager
2026-01-17T18:37:11.138373 - [ComfyUI-Manager] network_mode: public
2026-01-17T18:37:11.145371 - [ComfyUI-Manager] The matrix sharing feature has been disabled because the `matrix-nio` dependency is not installed.
	To use this feature, please run the following command:
	C:\Conf2\.venv\Scripts\python.exe -m pip install matrix-nio

2026-01-17T18:37:11.554961 - Total VRAM 16303 MB, total RAM 31861 MB
2026-01-17T18:37:11.554961 - pytorch version: 2.9.1+cu130
2026-01-17T18:37:11.554961 - Set vram state to: NORMAL_VRAM
2026-01-17T18:37:11.554961 - Device: cuda:0 NVIDIA GeForce RTX 5070 Ti : cudaMallocAsync
2026-01-17T18:37:11.561956 - Using async weight offloading with 2 streams
2026-01-17T18:37:11.561956 - Enabled pinned memory 14337.0
2026-01-17T18:37:11.944002 - ComfyUI-GGUF: Allowing full torch compile
2026-01-17T18:37:12.221746 - # 😺dzNodes: LayerStyle -> �[1;33mCannot import name 'guidedFilter' from 'cv2.ximgproc'
A few nodes cannot works properly, while most nodes are not affected. Please REINSTALL package 'opencv-contrib-python'.
For detail refer to �[4mhttps://github.com/chflame163/ComfyUI_LayerStyle/issues/5�[0m�[m2026-01-17T18:37:12.221746 - 
2026-01-17T18:37:12.350579 - 
2026-01-17T18:37:12.350579 - �[92m[rgthree-comfy] Loaded 48 epic nodes. 🎉�[0m2026-01-17T18:37:12.350579 - 
2026-01-17T18:37:12.350579 - 
2026-01-17T18:37:12.350579 - �[33m[rgthree-comfy] ComfyUI's new Node 2.0 rendering may be incompatible with some rgthree-comfy nodes and features, breaking some rendering as well as losing the ability to access a node's properties (a vital part of many nodes). It also appears to run MUCH more slowly spiking CPU usage and causing jankiness and unresponsiveness, especially with large workflows. Personally I am not planning to use the new Nodes 2.0 and, unfortunately, am not able to invest the time to investigate and overhaul rgthree-comfy where needed. If you have issues when Nodes 2.0 is enabled, I'd urge you to switch it off as well and join me in hoping ComfyUI is not planning to deprecate the existing, stable canvas rendering all together.
�[0m2026-01-17T18:37:12.350579 - 
2026-01-17T18:37:12.350579 - 
Import times for custom nodes:
2026-01-17T18:37:12.350579 -    0.0 seconds: C:\Conf\ComfyUI\resources\ComfyUI\custom_nodes\websocket_image_save.py
2026-01-17T18:37:12.350579 -    0.0 seconds: C:\Conf2\custom_nodes\comfyui-wanmove-adapter
2026-01-17T18:37:12.350579 -    0.0 seconds: C:\Conf2\custom_nodes\WanMoEScheduler
2026-01-17T18:37:12.350579 -    0.0 seconds: C:\Conf2\custom_nodes\WanMove-Trajectory
2026-01-17T18:37:12.350579 -    0.0 seconds: C:\Conf2\custom_nodes\ComfyUI-GGUF
2026-01-17T18:37:12.350579 -    0.0 seconds: C:\Conf2\custom_nodes\rgthree-comfy
2026-01-17T18:37:12.350579 -    0.0 seconds: C:\Conf2\custom_nodes\comfyui-videohelpersuite
2026-01-17T18:37:12.350579 -    0.0 seconds: C:\Conf2\custom_nodes\comfyui-kjnodes
2026-01-17T18:37:12.350579 -    0.3 seconds: C:\Conf2\custom_nodes\comfyui_layerstyle
2026-01-17T18:37:12.350579 - 
2026-01-17T18:37:12.554870 - Failed to initialize database. Please ensure you have installed the latest requirements. If the error persists, please report this as in future the database will be required: (sqlite3.OperationalError) unable to open database file
(Background on this error at: https://sqlalche.me/e/20/e3q8)
2026-01-17T18:37:12.589596 - Starting server

2026-01-17T18:37:12.589596 - To see the GUI go to: http://127.0.0.1:8002
2026-01-17T18:37:18.807768 - comfyui-frontend-package not found in requirements.txt
2026-01-17T18:37:19.020010 - [DEPRECATION WARNING] Detected import of deprecated legacy API: /extensions/core/widgetInputs.js. This is likely caused by a custom node extension using outdated APIs. Please update your extensions or contact the extension author for an updated version.
2026-01-17T18:38:03.069963 - got prompt
2026-01-17T18:38:03.069963 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#90'", 'extra_info': {}}

Attached Workflow

Please make sure that workflow does not contain any sensitive information such as API keys or passwords.

Workflow too large. Please manually upload the workflow from local file system.

Additional Context

(Please add any additional context or steps to reproduce the error here)

Logs

Other

No response

[christian-byrne]

This issue has been addressed with improved error messaging in frontend v1.39.5 (backend: #12177, frontend: Comfy-Org/ComfyUI_frontend#8511).

The cryptic "Cannot execute because a node is missing the class_type property" error now shows:

• The actual node type (e.g., KSampler, LoadImage) that is missing
• The node's custom title if you renamed it in the workflow
• A hint to install missing custom nodes via ComfyUI Manager

To get the fix: Update frontend to v1.39.5+ or use --front-end-version Comfy-Org/ComfyUI_frontend@1.39.5. ComfyUI Desktop users will receive this in the next stable release (~mid-February 2026).

If the node source shows "Unknown": This happens when the Manager is not installed or the node is not in the registry. You can enable the built-in Manager with --enable-manager, use the legacy Manager UI with --enable-manager --enable-manager-legacy-ui, or install ComfyUI-Manager as a custom node. The node ID in the error message can still help you locate it in the workflow.

Feel free to reopen this issue if the problem persists after updating. Please include your ComfyUI version, frontend version (visible in bottom-right corner), and a screenshot of the error dialog.

For general guidance see https://docs.comfy.org, or contact support@comfy.org for additional help.