Prompt execution failed Cannot execute because a node is missing the class_type property.: Node ID '#530'

[Nulixir]

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

Prompt execution failed
Cannot execute because a node is missing the class_type property.: Node ID '#530'

Logs

Other

No response

[interbiznw]

This is a you problem, not a program or code problem. Its a problem with your workflow, go in the workflow json and search id": 530 and you will see what node is causing the problems

[Nulixir]

it jwimageFROMextractbatch

[Nulixir]

jamesWalker55/comfyui-various#20

[Nulixir]

This is a you problem, not a program or code problem. Its a problem with your workflow, go in the workflow json and search id": 530 and you will see what node is causing the problems

ComfyUI Error Report

Error Details

• Node ID: N/A
• Node Type: N/A
• Exception Type: Prompt execution failed
• Exception Message: Cannot execute because a node is missing the class_type property.: Node ID 'docker #530'

Stack Trace

Error: Prompt execution failed
    at ComfyApi.queuePrompt (http://127.0.0.1:8001/assets/index-azSeANjR.js:4:5485)
    at async Ae.queuePrompt (http://127.0.0.1:8001/extensions/comfyui-easy-use/assets/extensions-WrZZZUnM.js:1:157581)
    at async PromptService.api.queuePrompt (http://127.0.0.1:8001/rgthree/common/prompt_service.js:88:28)
    at async ComfyApp.queuePrompt (http://127.0.0.1:8001/assets/index-azSeANjR.js:253:17414)
    at async app.queuePrompt (http://127.0.0.1:8001/extensions/rgthree-comfy/rgthree.js:478:24)
    at async Proxy.function (http://127.0.0.1:8001/assets/GraphView-CyYDa8uS.js:15:72634)
    at async http://127.0.0.1:8001/assets/index-azSeANjR.js:62:267474
    at async Proxy.execute (http://127.0.0.1:8001/assets/index-azSeANjR.js:62:286967)
    at async queuePrompt (http://127.0.0.1:8001/assets/ComfyQueueButton-BH3dqSji.js:1:3164)

System Information

• ComfyUI Version: 0.7.0
• Arguments: C:\Users\bryce\AppData\Local\Programs\ComfyUI\resources\ComfyUI\main.py --user-directory C:\ComfyUI\user --input-directory C:\ComfyUI\input --output-directory C:\ComfyUI\output --front-end-root C:\Users\bryce\AppData\Local\Programs\ComfyUI\resources\ComfyUI\web_custom_versions\desktop_app --base-directory C:\ComfyUI --extra-model-paths-config C:\Users\bryce\AppData\Roaming\ComfyUI\extra_models_config.yaml --log-stdout --listen 127.0.0.1 --port 8001 --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: 2.8.0+cu129

Devices

• Name: cuda:0 NVIDIA GeForce RTX 5080 : cudaMallocAsync
  • Type: cuda
  • VRAM Total: 17094475776
  • VRAM Free: 15679356928
  • Torch VRAM Total: 0
  • Torch VRAM Free: 0

Logs

2026-01-07T21:05:01.617922 - Adding extra search path custom_nodes C:\ComfyUI\custom_nodes
2026-01-07T21:05:01.617922 - Adding extra search path download_model_base C:\ComfyUI\models
2026-01-07T21:05:01.617922 - Adding extra search path custom_nodes C:\Users\bryce\AppData\Local\Programs\ComfyUI\resources\ComfyUI\custom_nodes
2026-01-07T21:05:01.617922 - Setting output directory to: C:\ComfyUI\output
2026-01-07T21:05:01.617922 - Setting input directory to: C:\ComfyUI\input
2026-01-07T21:05:01.617922 - Setting user directory to: C:\ComfyUI\user
2026-01-07T21:05:01.755573 - [START] Security scan2026-01-07T21:05:01.755573 - 
2026-01-07T21:05:02.687235 - [DONE] Security scan2026-01-07T21:05:02.687235 - 
2026-01-07T21:05:02.687235 - ** ComfyUI startup time:2026-01-07T21:05:02.687235 -  2026-01-07T21:05:02.687235 - 2026-01-07 21:05:02.6872026-01-07T21:05:02.687235 - 
2026-01-07T21:05:02.687235 - ** Platform:2026-01-07T21:05:02.687235 -  2026-01-07T21:05:02.687235 - Windows2026-01-07T21:05:02.687235 - 
2026-01-07T21:05:02.687235 - ** Python version:2026-01-07T21:05:02.687235 -  2026-01-07T21:05:02.687235 - 3.12.11 (main, Aug 18 2025, 19:17:54) [MSC v.1944 64 bit (AMD64)]2026-01-07T21:05:02.687235 - 
2026-01-07T21:05:02.687235 - ** Python executable:2026-01-07T21:05:02.687235 -  2026-01-07T21:05:02.687235 - C:\ComfyUI\.venv\Scripts\python.exe2026-01-07T21:05:02.688233 - 
2026-01-07T21:05:02.688233 - ** ComfyUI Path:2026-01-07T21:05:02.688233 -  2026-01-07T21:05:02.688233 - C:\Users\bryce\AppData\Local\Programs\ComfyUI\resources\ComfyUI2026-01-07T21:05:02.688233 - 
2026-01-07T21:05:02.688233 - ** ComfyUI Base Folder Path:2026-01-07T21:05:02.688233 -  2026-01-07T21:05:02.688233 - C:\Users\bryce\AppData\Local\Programs\ComfyUI\resources\ComfyUI2026-01-07T21:05:02.688233 - 
2026-01-07T21:05:02.688233 - ** User directory:2026-01-07T21:05:02.688233 -  2026-01-07T21:05:02.688233 - C:\ComfyUI\user2026-01-07T21:05:02.688233 - 
2026-01-07T21:05:02.688233 - ** ComfyUI-Manager config path:2026-01-07T21:05:02.688233 -  2026-01-07T21:05:02.688233 - C:\ComfyUI\user\__manager\config.ini2026-01-07T21:05:02.688233 - 
2026-01-07T21:05:02.688233 - ** Log path:2026-01-07T21:05:02.688233 -  2026-01-07T21:05:02.688233 - C:\ComfyUI\user\comfyui.log2026-01-07T21:05:02.688233 - 
2026-01-07T21:05:03.564308 - [ComfyUI-Manager] Skipped fixing the 'comfyui-frontend-package' dependency because the ComfyUI is outdated.
2026-01-07T21:05:03.564308 - [PRE] ComfyUI-Manager
2026-01-07T21:05:04.718888 - Checkpoint files will always be loaded safely.
2026-01-07T21:05:04.787118 - Total VRAM 16303 MB, total RAM 64673 MB
2026-01-07T21:05:04.787118 - pytorch version: 2.8.0+cu129
2026-01-07T21:05:04.787118 - Set vram state to: NORMAL_VRAM
2026-01-07T21:05:04.788119 - Device: cuda:0 NVIDIA GeForce RTX 5080 : cudaMallocAsync
2026-01-07T21:05:04.802264 - Using async weight offloading with 2 streams
2026-01-07T21:05:04.802264 - Enabled pinned memory 29102.0
2026-01-07T21:05:05.738748 - Using pytorch attention
2026-01-07T21:05:07.375632 - Python version: 3.12.11 (main, Aug 18 2025, 19:17:54) [MSC v.1944 64 bit (AMD64)]
2026-01-07T21:05:07.375632 - ComfyUI version: 0.7.0
2026-01-07T21:05:07.392815 - [Prompt Server] web root: C:\Users\bryce\AppData\Local\Programs\ComfyUI\resources\ComfyUI\web_custom_versions\desktop_app
2026-01-07T21:05:07.393813 - [START] ComfyUI-Manager
2026-01-07T21:05:07.585822 - [ComfyUI-Manager] network_mode: public
2026-01-07T21:05:07.592884 - [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:\ComfyUI\.venv\Scripts\python.exe -m pip install matrix-nio

2026-01-07T21:05:08.233507 - Total VRAM 16303 MB, total RAM 64673 MB
2026-01-07T21:05:08.233507 - pytorch version: 2.8.0+cu129
2026-01-07T21:05:08.234507 - Set vram state to: NORMAL_VRAM
2026-01-07T21:05:08.234507 - Device: cuda:0 NVIDIA GeForce RTX 5080 : cudaMallocAsync
2026-01-07T21:05:08.250675 - Using async weight offloading with 2 streams
2026-01-07T21:05:08.250675 - Enabled pinned memory 29102.0
2026-01-07T21:05:10.144243 - �[34m[ComfyUI-Easy-Use] server: �[0mv1.3.4 �[92mLoaded�[0m2026-01-07T21:05:10.144243 - 
2026-01-07T21:05:10.144243 - �[34m[ComfyUI-Easy-Use] web root: �[0mC:\ComfyUI\custom_nodes\comfyui-easy-use\web_version/v2 �[92mLoaded�[0m2026-01-07T21:05:10.144243 - 
2026-01-07T21:05:10.523107 - Traceback (most recent call last):
  File "C:\Users\bryce\AppData\Local\Programs\ComfyUI\resources\ComfyUI\nodes.py", line 2149, in load_custom_node
    module_spec.loader.exec_module(module)
  File "<frozen importlib._bootstrap_external>", line 999, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "C:\ComfyUI\custom_nodes\ComfyUI-GIMM-VFI\__init__.py", line 1, in <module>
    from .nodes import NODE_CLASS_MAPPINGS, NODE_DISPLAY_NAME_MAPPINGS
  File "C:\ComfyUI\custom_nodes\ComfyUI-GIMM-VFI\nodes.py", line 9, in <module>
    from omegaconf import OmegaConf
ModuleNotFoundError: No module named 'omegaconf'

2026-01-07T21:05:10.523107 - Cannot import C:\ComfyUI\custom_nodes\ComfyUI-GIMM-VFI module for custom nodes: No module named 'omegaconf'
2026-01-07T21:05:10.597937 - 
2026-01-07T21:05:10.597937 - �[92m[rgthree-comfy] Loaded 48 extraordinary nodes. 🎉�[0m2026-01-07T21:05:10.597937 - 
2026-01-07T21:05:10.597937 - 
2026-01-07T21:05:10.597937 - �[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.
�[0m2026-01-07T21:05:10.597937 - 
2026-01-07T21:05:11.164728 - �[34mWAS Node Suite: �[0mOpenCV Python FFMPEG support is enabled�[0m2026-01-07T21:05:11.164728 - 
2026-01-07T21:05:11.164728 - �[34mWAS Node Suite �[93mWarning: �[0m`ffmpeg_bin_path` is not set in `C:\ComfyUI\custom_nodes\was-node-suite-comfyui\was_suite_config.json` config file. Will attempt to use system ffmpeg binaries if available.�[0m2026-01-07T21:05:11.164728 - 
2026-01-07T21:05:11.587140 - �[34mWAS Node Suite: �[0mFinished.�[0m �[32mLoaded�[0m �[0m220�[0m �[32mnodes successfully.�[0m2026-01-07T21:05:11.587140 - 
2026-01-07T21:05:11.587140 - 
	�[3m�[93m"The biggest risk is not taking any risk. In a world that is changing quickly, the only strategy that is guaranteed to fail is not taking risks."�[0m�[3m - Mark Zuckerberg�[0m
2026-01-07T21:05:11.587140 - 
2026-01-07T21:05:11.593206 - 
Import times for custom nodes:
2026-01-07T21:05:11.593206 -    0.0 seconds: C:\Users\bryce\AppData\Local\Programs\ComfyUI\resources\ComfyUI\custom_nodes\websocket_image_save.py
2026-01-07T21:05:11.593206 -    0.0 seconds: C:\ComfyUI\custom_nodes\wanblockswap
2026-01-07T21:05:11.593206 -    0.0 seconds: C:\ComfyUI\custom_nodes\comfyui-mxtoolkit
2026-01-07T21:05:11.593206 -    0.0 seconds (IMPORT FAILED): C:\ComfyUI\custom_nodes\ComfyUI-GIMM-VFI
2026-01-07T21:05:11.593206 -    0.0 seconds: C:\ComfyUI\custom_nodes\comfyui_essentials
2026-01-07T21:05:11.593206 -    0.0 seconds: C:\ComfyUI\custom_nodes\comfyui-custom-scripts
2026-01-07T21:05:11.593206 -    0.0 seconds: C:\ComfyUI\custom_nodes\comfyui-frame-interpolation
2026-01-07T21:05:11.593206 -    0.0 seconds: C:\ComfyUI\custom_nodes\comfyui-kjnodes
2026-01-07T21:05:11.593206 -    0.0 seconds: C:\ComfyUI\custom_nodes\rgthree-comfy
2026-01-07T21:05:11.593206 -    0.0 seconds: C:\ComfyUI\custom_nodes\comfyui-videohelpersuite
2026-01-07T21:05:11.593206 -    0.4 seconds: C:\ComfyUI\custom_nodes\comfyui-florence2
2026-01-07T21:05:11.593206 -    1.0 seconds: C:\ComfyUI\custom_nodes\was-node-suite-comfyui
2026-01-07T21:05:11.593206 -    1.4 seconds: C:\ComfyUI\custom_nodes\comfyui-easy-use
2026-01-07T21:05:11.593206 - 
2026-01-07T21:05:11.823684 - 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)
2026-01-07T21:05:11.871075 - Starting server

2026-01-07T21:05:11.872072 - To see the GUI go to: http://127.0.0.1:8001
2026-01-07T21:05:13.024260 - [ComfyUI-Manager] The ComfyRegistry cache update is still in progress, so an outdated cache is being used.
2026-01-07T21:05:13.069481 - FETCH DATA from: C:\ComfyUI\.venv\Lib\site-packages\comfyui_manager\custom-node-list.json2026-01-07T21:05:13.069481 - 2026-01-07T21:05:13.082581 -  [DONE]2026-01-07T21:05:13.082581 - 
2026-01-07T21:05:14.334523 - got prompt
2026-01-07T21:05:14.335523 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#530'", 'extra_info': {}}
2026-01-07T21:05:43.246926 - got prompt
2026-01-07T21:05:43.248926 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#530'", 'extra_info': {}}
2026-01-07T21:06:20.580491 - FETCH ComfyRegistry Data [DONE]
2026-01-07T21:06:20.709628 - [ComfyUI-Manager] default cache updated: https://api.comfy.org/nodes
2026-01-07T21:06:20.732873 - FETCH DATA from: C:\ComfyUI\user\__manager\cache\1514988643_custom-node-list.json2026-01-07T21:06:20.732873 - 2026-01-07T21:06:20.751082 -  [DONE]2026-01-07T21:06:20.751082 - 
2026-01-07T21:06:20.780080 - [ComfyUI-Manager] All startup tasks have been completed.
2026-01-07T21:08:56.229501 - got prompt
2026-01-07T21:08:56.234211 - Failed to validate prompt for output 398:
2026-01-07T21:08:56.234211 - * LoadImage 516:
2026-01-07T21:08:56.234211 -   - Custom validation failed for node: image - Invalid image file: 00001-902715564.png
2026-01-07T21:08:56.234211 - Output will be ignored
2026-01-07T21:08:56.234211 - Failed to validate prompt for output 526:
2026-01-07T21:08:56.234211 - Output will be ignored
2026-01-07T21:08:56.235229 - Failed to validate prompt for output 541:
2026-01-07T21:08:56.235229 - * easy batchAnything 529:
2026-01-07T21:08:56.235229 -   - Required input is missing: any_2
2026-01-07T21:08:56.235229 - Output will be ignored
2026-01-07T21:08:56.235229 - Failed to validate prompt for output 567:
2026-01-07T21:08:56.235229 - Output will be ignored
2026-01-07T21:08:56.235229 - Failed to validate prompt for output 537:
2026-01-07T21:08:56.235229 - Output will be ignored
2026-01-07T21:08:56.240231 - WARNING: [Errno 2] No such file or directory: 'C:\\ComfyUI\\input\\00001-902715564.png'
2026-01-07T21:08:56.261449 - Prompt executed in 0.02 seconds
2026-01-07T21:09:08.562734 - got prompt
2026-01-07T21:09:08.564733 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#530'", 'extra_info': {}}
2026-01-07T21:09:20.852461 - got prompt
2026-01-07T21:09:20.854463 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#530'", 'extra_info': {}}
2026-01-07T21:09:47.093141 - got prompt
2026-01-07T21:09:47.095267 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#530'", '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)

[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.