not able to run workflow

[picklerick-07]

Custom Node Testing

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

Expected Behavior

Cannot execute because a node is missing the class_type property.: Node ID '#884'

Actual Behavior

Cannot execute because a node is missing the class_type property.: Node ID '#884'

Steps to Reproduce

Cannot execute because a node is missing the class_type property.: Node ID '#884'

Debug Logs

# 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 '#884'
## Stack Trace

Error: Prompt execution failed
    at ComfyApi.queuePrompt (http://127.0.0.1:8003/assets/index-FzulNJ_1.js:56:5402)
    at async ComfyApp.queuePrompt (http://127.0.0.1:8003/assets/index-FzulNJ_1.js:249:17405)
    at async Proxy.function (http://127.0.0.1:8003/assets/GraphView-DWyPX_-5.js:13:62584)
    at async http://127.0.0.1:8003/assets/index-FzulNJ_1.js:60:16805
    at async Proxy.execute (http://127.0.0.1:8003/assets/index-FzulNJ_1.js:60:36066)
    at async queuePrompt (http://127.0.0.1:8003/assets/ComfyQueueButton-CYI_I_yI.js:1:3089)

## System Information
- **ComfyUI Version:** 0.4.0
- **Arguments:** C:\Users\KARTHIK\AppData\Local\Programs\ComfyUI\resources\ComfyUI\main.py --user-directory C:\Users\KARTHIK\Documents\cumfy\user --input-directory C:\Users\KARTHIK\Documents\cumfy\input --output-directory C:\Users\KARTHIK\Documents\cumfy\output --front-end-root C:\Users\KARTHIK\AppData\Local\Programs\ComfyUI\resources\ComfyUI\web_custom_versions\desktop_app --base-directory C:\Users\KARTHIK\Documents\cumfy --extra-model-paths-config C:\Users\KARTHIK\AppData\Roaming\ComfyUI\extra_models_config.yaml --log-stdout --listen 127.0.0.1 --port 8003 --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 4070 SUPER : cudaMallocAsync
  - **Type:** cuda
  - **VRAM Total:** 12878086144
  - **VRAM Free:** 11587813376
  - **Torch VRAM Total:** 0
  - **Torch VRAM Free:** 0

## Logs

2025-12-16T15:28:55.810174 - Adding extra search path custom_nodes C:\Users\KARTHIK\Documents\cumfy\custom_nodes
2025-12-16T15:28:55.810174 - Adding extra search path download_model_base C:\Users\KARTHIK\Documents\cumfy\models
2025-12-16T15:28:55.810174 - Adding extra search path custom_nodes C:\Users\KARTHIK\AppData\Local\Programs\ComfyUI\resources\ComfyUI\custom_nodes
2025-12-16T15:28:55.810174 - Setting output directory to: C:\Users\KARTHIK\Documents\cumfy\output
2025-12-16T15:28:55.810174 - Setting input directory to: C:\Users\KARTHIK\Documents\cumfy\input
2025-12-16T15:28:55.810174 - Setting user directory to: C:\Users\KARTHIK\Documents\cumfy\user
2025-12-16T15:28:56.250839 - [START] Security scan2025-12-16T15:28:56.250839 - 
2025-12-16T15:28:57.461696 - [DONE] Security scan2025-12-16T15:28:57.462196 - 
2025-12-16T15:28:57.462697 - ** ComfyUI startup time:2025-12-16T15:28:57.462697 -  2025-12-16T15:28:57.462697 - 2025-12-16 15:28:57.4622025-12-16T15:28:57.462697 - 
2025-12-16T15:28:57.462697 - ** Platform:2025-12-16T15:28:57.462697 -  2025-12-16T15:28:57.462697 - Windows2025-12-16T15:28:57.462697 - 
2025-12-16T15:28:57.462697 - ** Python version:2025-12-16T15:28:57.462697 -  2025-12-16T15:28:57.462697 - 3.12.11 (main, Aug 18 2025, 19:17:54) [MSC v.1944 64 bit (AMD64)]2025-12-16T15:28:57.463198 - 
2025-12-16T15:28:57.463198 - ** Python executable:2025-12-16T15:28:57.463198 -  2025-12-16T15:28:57.463198 - C:\Users\KARTHIK\Documents\cumfy\.venv\Scripts\python.exe2025-12-16T15:28:57.463198 - 
2025-12-16T15:28:57.463198 - ** ComfyUI Path:2025-12-16T15:28:57.463198 -  2025-12-16T15:28:57.463198 - C:\Users\KARTHIK\AppData\Local\Programs\ComfyUI\resources\ComfyUI2025-12-16T15:28:57.463198 - 
2025-12-16T15:28:57.463198 - ** ComfyUI Base Folder Path:2025-12-16T15:28:57.463198 -  2025-12-16T15:28:57.463198 - C:\Users\KARTHIK\AppData\Local\Programs\ComfyUI\resources\ComfyUI2025-12-16T15:28:57.463198 - 
2025-12-16T15:28:57.463198 - ** User directory:2025-12-16T15:28:57.463198 -  2025-12-16T15:28:57.463198 - C:\Users\KARTHIK\Documents\cumfy\user2025-12-16T15:28:57.463198 - 
2025-12-16T15:28:57.463198 - ** ComfyUI-Manager config path:2025-12-16T15:28:57.463696 -  2025-12-16T15:28:57.463696 - C:\Users\KARTHIK\Documents\cumfy\user\__manager\config.ini2025-12-16T15:28:57.463696 - 
2025-12-16T15:28:57.463696 - ** Log path:2025-12-16T15:28:57.463696 -  2025-12-16T15:28:57.463696 - C:\Users\KARTHIK\Documents\cumfy\user\comfyui.log2025-12-16T15:28:57.463696 - 
2025-12-16T15:28:58.673698 - [ComfyUI-Manager] Skipped fixing the 'comfyui-frontend-package' dependency because the ComfyUI is outdated.
2025-12-16T15:28:58.674196 - [PRE] ComfyUI-Manager
2025-12-16T15:29:00.162979 - Checkpoint files will always be loaded safely.
2025-12-16T15:29:00.262883 - Total VRAM 12282 MB, total RAM 32693 MB
2025-12-16T15:29:00.263385 - pytorch version: 2.8.0+cu129
2025-12-16T15:29:00.263887 - Set vram state to: NORMAL_VRAM
2025-12-16T15:29:00.264386 - Device: cuda:0 NVIDIA GeForce RTX 4070 SUPER : cudaMallocAsync
2025-12-16T15:29:00.283883 - Using async weight offloading with 2 streams
2025-12-16T15:29:00.283883 - Enabled pinned memory 14711.0
2025-12-16T15:29:01.495273 - Using pytorch attention
2025-12-16T15:29:03.511927 - Python version: 3.12.11 (main, Aug 18 2025, 19:17:54) [MSC v.1944 64 bit (AMD64)]
2025-12-16T15:29:03.512425 - ComfyUI version: 0.4.0
2025-12-16T15:29:03.536924 - [Prompt Server] web root: C:\Users\KARTHIK\AppData\Local\Programs\ComfyUI\resources\ComfyUI\web_custom_versions\desktop_app
2025-12-16T15:29:03.537425 - [START] ComfyUI-Manager
2025-12-16T15:29:03.765015 - [ComfyUI-Manager] network_mode: public
2025-12-16T15:29:03.795030 - [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:\Users\KARTHIK\Documents\cumfy\.venv\Scripts\python.exe -m pip install matrix-nio

2025-12-16T15:29:04.550997 - Total VRAM 12282 MB, total RAM 32693 MB
2025-12-16T15:29:04.551496 - pytorch version: 2.8.0+cu129
2025-12-16T15:29:04.551997 - Set vram state to: NORMAL_VRAM
2025-12-16T15:29:04.551997 - Device: cuda:0 NVIDIA GeForce RTX 4070 SUPER : cudaMallocAsync
2025-12-16T15:29:04.566005 - Using async weight offloading with 2 streams
2025-12-16T15:29:04.566005 - Enabled pinned memory 14711.0
2025-12-16T15:29:05.548893 - �[36;20m[C:\Users\KARTHIK\Documents\cumfy\custom_nodes\comfy-mtb] | INFO -> loaded �[96m103�[0m nodes successfuly�[0m
2025-12-16T15:29:05.549893 - �[36;20m[C:\Users\KARTHIK\Documents\cumfy\custom_nodes\comfy-mtb] | INFO -> Some nodes (5) could not be loaded. This can be ignored, but go to http://127.0.0.1:8003/mtb if you want more information.�[0m
2025-12-16T15:29:05.580413 - ### Loading: ComfyUI-Impact-Pack (V8.28)
2025-12-16T15:29:05.745615 - [Impact Pack] Wildcard total size (0.00 MB) is within cache limit (50.00 MB). Using full cache mode.
2025-12-16T15:29:05.747113 - [Impact Pack] Wildcards loading done.
2025-12-16T15:29:05.769125 - Blocked by policy: C:\Users\KARTHIK\Documents\cumfy\custom_nodes\ComfyUI-Manager
2025-12-16T15:29:07.290680 - Warning: Could not load sageattention: No module named 'sageattention'
2025-12-16T15:29:07.290680 - sageattention package is not installed, sageattention will not be available
2025-12-16T15:29:07.822898 - WanVideoWrapper WARNING: FantasyPortrait nodes not available: No module named 'onnx'
2025-12-16T15:29:07.848899 - (pysssss:WD14Tagger) [DEBUG] Available ORT providers: TensorrtExecutionProvider, CUDAExecutionProvider, CPUExecutionProvider2025-12-16T15:29:07.849903 - 
2025-12-16T15:29:07.849903 - (pysssss:WD14Tagger) [DEBUG] Using ORT providers: CUDAExecutionProvider, CPUExecutionProvider2025-12-16T15:29:07.849903 - 
2025-12-16T15:29:07.853408 - �[36;20m[C:\Users\KARTHIK\Documents\cumfy\custom_nodes\comfyui_controlnet_aux] | INFO -> Using ckpts path: C:\Users\KARTHIK\Documents\cumfy\custom_nodes\comfyui_controlnet_aux\ckpts�[0m
2025-12-16T15:29:07.853908 - �[36;20m[C:\Users\KARTHIK\Documents\cumfy\custom_nodes\comfyui_controlnet_aux] | INFO -> Using symlinks: False�[0m
2025-12-16T15:29:07.854408 - �[36;20m[C:\Users\KARTHIK\Documents\cumfy\custom_nodes\comfyui_controlnet_aux] | INFO -> Using ort providers: ['CUDAExecutionProvider', 'DirectMLExecutionProvider', 'OpenVINOExecutionProvider', 'ROCMExecutionProvider', 'CPUExecutionProvider', 'CoreMLExecutionProvider']�[0m
2025-12-16T15:29:08.282097 - DWPose: Onnxruntime with acceleration providers detected2025-12-16T15:29:08.282097 - 
2025-12-16T15:29:09.098274 - �[34mWAS Node Suite: �[0mOpenCV Python FFMPEG support is enabled�[0m2025-12-16T15:29:09.098274 - 
2025-12-16T15:29:09.098274 - �[34mWAS Node Suite �[93mWarning: �[0m`ffmpeg_bin_path` is not set in `C:\Users\KARTHIK\Documents\cumfy\custom_nodes\was-ns\was_suite_config.json` config file. Will attempt to use system ffmpeg binaries if available.�[0m2025-12-16T15:29:09.098274 - 
2025-12-16T15:29:09.226833 - FETCH ComfyRegistry Data: 5/112
2025-12-16T15:29:09.682505 - �[34mWAS Node Suite: �[0mFinished.�[0m �[32mLoaded�[0m �[0m220�[0m �[32mnodes successfully.�[0m2025-12-16T15:29:09.682505 - 
2025-12-16T15:29:09.682505 - 
	�[3m�[93m"Art is the mirror that reflects the beauty within us."�[0m�[3m - Unknown�[0m
2025-12-16T15:29:09.682505 - 
2025-12-16T15:29:09.689002 - Blocked by policy: C:\Users\KARTHIK\AppData\Local\Programs\ComfyUI\resources\ComfyUI\custom_nodes\ComfyUI-Manager
2025-12-16T15:29:09.690002 - 
Import times for custom nodes:
2025-12-16T15:29:09.690002 -    0.0 seconds: C:\Users\KARTHIK\AppData\Local\Programs\ComfyUI\resources\ComfyUI\custom_nodes\websocket_image_save.py
2025-12-16T15:29:09.690002 -    0.0 seconds: C:\Users\KARTHIK\Documents\cumfy\custom_nodes\sdxl_prompt_styler
2025-12-16T15:29:09.690002 -    0.0 seconds: C:\Users\KARTHIK\Documents\cumfy\custom_nodes\comfyui-wd14-tagger
2025-12-16T15:29:09.690002 -    0.0 seconds: C:\Users\KARTHIK\Documents\cumfy\custom_nodes\comfyui_ipadapter_plus
2025-12-16T15:29:09.690002 -    0.0 seconds: C:\Users\KARTHIK\Documents\cumfy\custom_nodes\ComfyMath
2025-12-16T15:29:09.690002 -    0.0 seconds: C:\Users\KARTHIK\Documents\cumfy\custom_nodes\comfyui-custom-scripts
2025-12-16T15:29:09.690002 -    0.0 seconds: C:\Users\KARTHIK\Documents\cumfy\custom_nodes\comfyui_essentials
2025-12-16T15:29:09.690002 -    0.0 seconds: C:\Users\KARTHIK\Documents\cumfy\custom_nodes\comfyui_ultimatesdupscale
2025-12-16T15:29:09.690002 -    0.0 seconds: C:\Users\KARTHIK\Documents\cumfy\custom_nodes\comfyui-kjnodes
2025-12-16T15:29:09.690002 -    0.0 seconds: C:\Users\KARTHIK\Documents\cumfy\custom_nodes\comfyui-videohelpersuite
2025-12-16T15:29:09.690503 -    0.2 seconds: C:\Users\KARTHIK\Documents\cumfy\custom_nodes\comfyui-impact-pack
2025-12-16T15:29:09.690503 -    0.4 seconds: C:\Users\KARTHIK\Documents\cumfy\custom_nodes\comfy-mtb
2025-12-16T15:29:09.690503 -    0.4 seconds: C:\Users\KARTHIK\Documents\cumfy\custom_nodes\comfyui_controlnet_aux
2025-12-16T15:29:09.690503 -    1.4 seconds: C:\Users\KARTHIK\Documents\cumfy\custom_nodes\was-ns
2025-12-16T15:29:09.690503 -    2.0 seconds: C:\Users\KARTHIK\Documents\cumfy\custom_nodes\ComfyUI-WanVideoWrapper
2025-12-16T15:29:09.690503 - 
2025-12-16T15:29:09.970112 - 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)
2025-12-16T15:29:10.038637 - Starting server

2025-12-16T15:29:10.039137 - To see the GUI go to: http://127.0.0.1:8003
2025-12-16T15:29:10.915896 - comfyui-frontend-package not found in requirements.txt
2025-12-16T15:29:11.123006 - [DEPRECATION WARNING] Detected import of deprecated legacy API: /scripts/ui.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.
2025-12-16T15:29:11.127006 - [DEPRECATION WARNING] Detected import of deprecated legacy API: /extensions/core/clipspace.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.
2025-12-16T15:29:11.127505 - [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.
2025-12-16T15:29:11.899823 - [DEPRECATION WARNING] Detected import of deprecated legacy API: /scripts/ui/components/button.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.
2025-12-16T15:29:14.809686 - FETCH ComfyRegistry Data: 10/112
2025-12-16T15:29:19.898338 - FETCH ComfyRegistry Data: 15/112
2025-12-16T15:29:25.147398 - FETCH ComfyRegistry Data: 20/112
2025-12-16T15:29:30.496705 - FETCH ComfyRegistry Data: 25/112
2025-12-16T15:29:35.819940 - FETCH ComfyRegistry Data: 30/112
2025-12-16T15:29:41.100075 - FETCH ComfyRegistry Data: 35/112
2025-12-16T15:29:46.364260 - FETCH ComfyRegistry Data: 40/112
2025-12-16T15:29:52.014222 - FETCH ComfyRegistry Data: 45/112
2025-12-16T15:29:57.232200 - FETCH ComfyRegistry Data: 50/112
2025-12-16T15:30:02.140322 - FETCH ComfyRegistry Data: 55/112
2025-12-16T15:30:07.023966 - FETCH ComfyRegistry Data: 60/112
2025-12-16T15:30:12.626261 - FETCH ComfyRegistry Data: 65/112
2025-12-16T15:30:17.798697 - FETCH ComfyRegistry Data: 70/112
2025-12-16T15:30:22.833815 - FETCH ComfyRegistry Data: 75/112
2025-12-16T15:30:29.545310 - FETCH ComfyRegistry Data: 80/112
2025-12-16T15:30:34.668105 - FETCH ComfyRegistry Data: 85/112
2025-12-16T15:30:40.742433 - FETCH ComfyRegistry Data: 90/112
2025-12-16T15:30:46.450241 - FETCH ComfyRegistry Data: 95/112
2025-12-16T15:30:51.870242 - FETCH ComfyRegistry Data: 100/112
2025-12-16T15:30:57.424664 - FETCH ComfyRegistry Data: 105/112
2025-12-16T15:31:02.522508 - FETCH ComfyRegistry Data: 110/112
2025-12-16T15:31:02.832170 - got prompt
2025-12-16T15:31:02.837171 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#884'", 'extra_info': {}}
2025-12-16T15:31:06.000747 - FETCH ComfyRegistry Data [DONE]
2025-12-16T15:31:06.150800 - [ComfyUI-Manager] default cache updated: https://api.comfy.org/nodes
2025-12-16T15:31:06.177304 - FETCH DATA from: C:\Users\KARTHIK\Documents\cumfy\user\__manager\cache\1514988643_custom-node-list.json2025-12-16T15:31:06.177304 - 2025-12-16T15:31:06.198827 -  [DONE]2025-12-16T15:31:06.199328 - 
2025-12-16T15:31:06.234332 - [ComfyUI-Manager] All startup tasks have been completed.
2025-12-16T15:45:29.834058 - got prompt
2025-12-16T15:45:29.840057 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#884'", 'extra_info': {}}
2025-12-16T15:53:08.202847 - got prompt
2025-12-16T15:53:08.208356 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#884'", 'extra_info': {}}
2025-12-16T16:00:38.147262 - got prompt
2025-12-16T16:00:38.153265 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#884'", '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)

Other

No response

[Soddentrough]

Hitting the same issue:

ComfyUI Version: v0.4.0-40-g827bb151 | Released on '2025-12-16'

Loading: ComfyUI-Manager (V3.38.3)

"Run" results in : Cannot execute because a node is missing the class_type property.: Node ID '#100'

[liuxiangfang]

我也是遇到

[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.