Cannot execute because a node is missing the class_type property.: Node ID '#16'

[JASWANTHSANGAREDDI]

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: Prompt execution failed
• Exception Message: Cannot execute because a node is missing the class_type property.: Node ID 'empty cache after execute() #16'

Stack Trace

Error: Prompt execution failed
    at ComfyApi.queuePrompt (http://127.0.0.1:8010/assets/index-CWzmkThr.js:121273:13)
    at async ComfyApi.queuePrompt_with_seed (http://127.0.0.1:8010/extensions/comfyui-easy-use/assets/extensions-CvRfBMyE.js:1:180845)
    at async PromptService.api.queuePrompt (http://127.0.0.1:8010/rgthree/common/prompt_service.js:88:28)
    at async ComfyApp.queuePrompt (http://127.0.0.1:8010/assets/index-CWzmkThr.js:275920:25)
    at async app.queuePrompt (http://127.0.0.1:8010/extensions/rgthree-comfy/rgthree.js:464:24)
    at async function (http://127.0.0.1:8010/assets/GraphView-BXiTAe2v.js:6886:9)
    at async http://127.0.0.1:8010/assets/index-CWzmkThr.js:207325:14
    at async Proxy.execute (http://127.0.0.1:8010/assets/index-CWzmkThr.js:208969:7)
    at async queuePrompt (http://127.0.0.1:8010/assets/GraphView-BXiTAe2v.js:5324:7)

System Information

• ComfyUI Version: 0.3.45
• Arguments: C:\Users\ADMIN\AppData\Local\Programs@comfyorgcomfyui-electron\resources\ComfyUI\main.py --user-directory C:\Users\ADMIN\Documents\ComfyUI\user --input-directory C:\Users\ADMIN\Documents\ComfyUI\input --output-directory C:\Users\ADMIN\Documents\ComfyUI\output --front-end-root C:\Users\ADMIN\AppData\Local\Programs@comfyorgcomfyui-electron\resources\ComfyUI\web_custom_versions\desktop_app --base-directory C:\Users\ADMIN\Documents\ComfyUI --extra-model-paths-config C:\Users\ADMIN\AppData\Roaming\ComfyUI\extra_models_config.yaml --log-stdout --listen 127.0.0.1 --port 8010
• OS: nt
• Python Version: 3.12.9 (main, Feb 12 2025, 14:52:31) [MSC v.1942 64 bit (AMD64)]
• Embedded Python: false
• PyTorch Version: 2.7.0+cu128

Devices

• Name: cuda:0 NVIDIA GeForce RTX 3060 : cudaMallocAsync
  • Type: cuda
  • VRAM Total: 12884377600
  • VRAM Free: 11788091392
  • Torch VRAM Total: 0
  • Torch VRAM Free: 0

Logs

2025-07-26T17:27:11.023189 - Adding extra search path custom_nodes C:\Users\ADMIN\Documents\ComfyUI\custom_nodes
2025-07-26T17:27:11.023189 - Adding extra search path download_model_base C:\Users\ADMIN\Documents\ComfyUI\models
2025-07-26T17:27:11.023189 - Adding extra search path custom_nodes C:\Users\ADMIN\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\custom_nodes
2025-07-26T17:27:11.023189 - Setting output directory to: C:\Users\ADMIN\Documents\ComfyUI\output
2025-07-26T17:27:11.023189 - Setting input directory to: C:\Users\ADMIN\Documents\ComfyUI\input
2025-07-26T17:27:11.023189 - Setting user directory to: C:\Users\ADMIN\Documents\ComfyUI\user
2025-07-26T17:27:11.495228 - [START] Security scan2025-07-26T17:27:11.495228 - 
2025-07-26T17:27:12.196474 - [DONE] Security scan2025-07-26T17:27:12.196474 - 
2025-07-26T17:27:12.278674 - ## ComfyUI-Manager: installing dependencies done.2025-07-26T17:27:12.278674 - 
2025-07-26T17:27:12.278674 - ** ComfyUI startup time:2025-07-26T17:27:12.278674 -  2025-07-26T17:27:12.278674 - 2025-07-26 17:27:12.2782025-07-26T17:27:12.278674 - 
2025-07-26T17:27:12.278674 - ** Platform:2025-07-26T17:27:12.278674 -  2025-07-26T17:27:12.278674 - Windows2025-07-26T17:27:12.278674 - 
2025-07-26T17:27:12.278674 - ** Python version:2025-07-26T17:27:12.278674 -  2025-07-26T17:27:12.278674 - 3.12.9 (main, Feb 12 2025, 14:52:31) [MSC v.1942 64 bit (AMD64)]2025-07-26T17:27:12.278674 - 
2025-07-26T17:27:12.278674 - ** Python executable:2025-07-26T17:27:12.278674 -  2025-07-26T17:27:12.278674 - C:\Users\ADMIN\Documents\ComfyUI\.venv\Scripts\python.exe2025-07-26T17:27:12.278674 - 
2025-07-26T17:27:12.278674 - ** ComfyUI Path:2025-07-26T17:27:12.278674 -  2025-07-26T17:27:12.278674 - C:\Users\ADMIN\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI2025-07-26T17:27:12.278674 - 
2025-07-26T17:27:12.278674 - ** ComfyUI Base Folder Path:2025-07-26T17:27:12.278674 -  2025-07-26T17:27:12.278674 - C:\Users\ADMIN\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI2025-07-26T17:27:12.278674 - 
2025-07-26T17:27:12.278674 - ** User directory:2025-07-26T17:27:12.278674 -  2025-07-26T17:27:12.278674 - C:\Users\ADMIN\Documents\ComfyUI\user2025-07-26T17:27:12.278674 - 
2025-07-26T17:27:12.278674 - ** ComfyUI-Manager config path:2025-07-26T17:27:12.278674 -  2025-07-26T17:27:12.278674 - C:\Users\ADMIN\Documents\ComfyUI\user\default\ComfyUI-Manager\config.ini2025-07-26T17:27:12.278674 - 
2025-07-26T17:27:12.278674 - ** Log path:2025-07-26T17:27:12.278674 -  2025-07-26T17:27:12.278674 - C:\Users\ADMIN\Documents\ComfyUI\user\comfyui.log2025-07-26T17:27:12.278674 - 
2025-07-26T17:27:13.099650 - [ComfyUI-Manager] Failed to restore comfyui-frontend-package
2025-07-26T17:27:13.099650 - expected str, bytes or os.PathLike object, not NoneType
2025-07-26T17:27:13.100705 - 
Prestartup times for custom nodes:
2025-07-26T17:27:13.100705 -    2.1 seconds: C:\Users\ADMIN\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\custom_nodes\ComfyUI-Manager
2025-07-26T17:27:13.100705 - 
2025-07-26T17:27:14.222599 - Checkpoint files will always be loaded safely.
2025-07-26T17:27:14.317482 - Total VRAM 12288 MB, total RAM 65253 MB
2025-07-26T17:27:14.317482 - pytorch version: 2.7.0+cu128
2025-07-26T17:27:14.317482 - Set vram state to: NORMAL_VRAM
2025-07-26T17:27:14.318475 - Device: cuda:0 NVIDIA GeForce RTX 3060 : cudaMallocAsync
2025-07-26T17:27:15.319236 - Using pytorch attention
2025-07-26T17:27:15.334069 - torchaudio missing, ACE model will be broken
2025-07-26T17:27:15.337074 - torchaudio missing, ACE model will be broken
2025-07-26T17:27:16.187031 - Python version: 3.12.9 (main, Feb 12 2025, 14:52:31) [MSC v.1942 64 bit (AMD64)]
2025-07-26T17:27:16.187031 - ComfyUI version: 0.3.45
2025-07-26T17:27:16.207656 - [Prompt Server] web root: C:\Users\ADMIN\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\web_custom_versions\desktop_app
2025-07-26T17:27:16.672685 - Traceback (most recent call last):
  File "C:\Users\ADMIN\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\nodes.py", line 2124, 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:\Users\ADMIN\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\comfy_extras\nodes_audio.py", line 4, in <module>
    import torchaudio
  File "C:\Users\ADMIN\Documents\ComfyUI\.venv\Lib\site-packages\torchaudio\__init__.py", line 2, in <module>
    from . import _extension  # noqa  # usort: skip
    ^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\ADMIN\Documents\ComfyUI\.venv\Lib\site-packages\torchaudio\_extension\__init__.py", line 38, in <module>
    _load_lib("libtorchaudio")
  File "C:\Users\ADMIN\Documents\ComfyUI\.venv\Lib\site-packages\torchaudio\_extension\utils.py", line 60, in _load_lib
    torch.ops.load_library(path)
  File "C:\Users\ADMIN\Documents\ComfyUI\.venv\Lib\site-packages\torch\_ops.py", line 1392, in load_library
    ctypes.CDLL(path)
  File "C:\Users\ADMIN\AppData\Roaming\uv\python\cpython-3.12.9-windows-x86_64-none\Lib\ctypes\__init__.py", line 379, in __init__
    self._handle = _dlopen(self._name, mode)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: Could not find module 'C:\Users\ADMIN\Documents\ComfyUI\.venv\Lib\site-packages\torchaudio\lib\libtorchaudio.pyd' (or one of its dependencies). Try using the full path with constructor syntax.

2025-07-26T17:27:16.672685 - Cannot import C:\Users\ADMIN\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\comfy_extras\nodes_audio.py module for custom nodes: Could not find module 'C:\Users\ADMIN\Documents\ComfyUI\.venv\Lib\site-packages\torchaudio\lib\libtorchaudio.pyd' (or one of its dependencies). Try using the full path with constructor syntax.
2025-07-26T17:27:17.453863 - �[34m[ComfyUI-Easy-Use] server: �[0mv1.3.1 �[92mLoaded�[0m2025-07-26T17:27:17.453863 - 
2025-07-26T17:27:17.453863 - �[34m[ComfyUI-Easy-Use] web root: �[0mC:\Users\ADMIN\Documents\ComfyUI\custom_nodes\comfyui-easy-use\web_version/v2 �[92mLoaded�[0m2025-07-26T17:27:17.453863 - 
2025-07-26T17:27:17.761716 - Traceback (most recent call last):
  File "C:\Users\ADMIN\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\nodes.py", line 2124, 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:\Users\ADMIN\Documents\ComfyUI\custom_nodes\comfyui-reactor\__init__.py", line 23, in <module>
    from .nodes import NODE_CLASS_MAPPINGS, NODE_DISPLAY_NAME_MAPPINGS
  File "C:\Users\ADMIN\Documents\ComfyUI\custom_nodes\comfyui-reactor\nodes.py", line 17, in <module>
    from insightface.app.common import Face
ModuleNotFoundError: No module named 'insightface'

2025-07-26T17:27:17.762744 - Cannot import C:\Users\ADMIN\Documents\ComfyUI\custom_nodes\comfyui-reactor module for custom nodes: No module named 'insightface'
2025-07-26T17:27:18.173975 - 
2025-07-26T17:27:18.173975 - �[92m[rgthree-comfy] Loaded 47 exciting nodes. 🎉�[0m2025-07-26T17:27:18.173975 - 
2025-07-26T17:27:18.173975 - 
2025-07-26T17:27:18.180254 - ### Loading: ComfyUI-Manager (V3.30.4)
2025-07-26T17:27:18.180254 - [ComfyUI-Manager] network_mode: public
2025-07-26T17:27:18.180254 - ### ComfyUI Revision: UNKNOWN (The currently installed ComfyUI is not a Git repository)
2025-07-26T17:27:18.186246 - 
Import times for custom nodes:
2025-07-26T17:27:18.186246 -    0.0 seconds: C:\Users\ADMIN\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\custom_nodes\websocket_image_save.py
2025-07-26T17:27:18.187250 -    0.0 seconds (IMPORT FAILED): C:\Users\ADMIN\Documents\ComfyUI\custom_nodes\comfyui-reactor
2025-07-26T17:27:18.187250 -    0.0 seconds: C:\Users\ADMIN\Documents\ComfyUI\custom_nodes\comfyui_ipadapter_plus
2025-07-26T17:27:18.187250 -    0.0 seconds: C:\Users\ADMIN\Documents\ComfyUI\custom_nodes\comfyui_essentials
2025-07-26T17:27:18.187250 -    0.0 seconds: C:\Users\ADMIN\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\custom_nodes\ComfyUI-Manager
2025-07-26T17:27:18.187250 -    0.3 seconds: C:\Users\ADMIN\Documents\ComfyUI\custom_nodes\comfyui-florence2
2025-07-26T17:27:18.187250 -    0.4 seconds: C:\Users\ADMIN\Documents\ComfyUI\custom_nodes\rgthree-comfy
2025-07-26T17:27:18.187250 -    0.6 seconds: C:\Users\ADMIN\Documents\ComfyUI\custom_nodes\comfyui-easy-use
2025-07-26T17:27:18.188246 - 
2025-07-26T17:27:18.188246 - WARNING: some comfy_extras/ nodes did not import correctly. This may be because they are missing some dependencies.

2025-07-26T17:27:18.188246 - IMPORT FAILED: nodes_audio.py
2025-07-26T17:27:18.188246 - 
This issue might be caused by new missing dependencies added the last time you updated ComfyUI.
2025-07-26T17:27:18.188246 - Please do a: pip install -r requirements.txt
2025-07-26T17:27:18.188246 - 
2025-07-26T17:27:18.218457 - [ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/alter-list.json
2025-07-26T17:27:18.236300 - [ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/model-list.json
2025-07-26T17:27:18.281230 - [ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/github-stats.json
2025-07-26T17:27:18.321137 - [ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/extension-node-map.json
2025-07-26T17:27:18.354144 - [ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/custom-node-list.json
2025-07-26T17:27:18.468204 - 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)
2025-07-26T17:27:18.479342 - Starting server

2025-07-26T17:27:18.479342 - To see the GUI go to: http://127.0.0.1:8010
2025-07-26T17:27:20.038136 - Traceback (most recent call last):
2025-07-26T17:27:20.038136 - 2025-07-26T17:27:20.038136 -   File "C:\Users\ADMIN\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\custom_nodes\ComfyUI-Manager\glob\manager_server.py", line 408, in do_install
    res = await core.unified_manager.install_by_id(node_name, version_spec, channel, mode, return_postinstall=skip_post_install)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-07-26T17:27:20.038136 - 2025-07-26T17:27:20.038136 -   File "C:\Users\ADMIN\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\custom_nodes\ComfyUI-Manager\glob\manager_core.py", line 1469, in install_by_id
    res = self.cnr_install(node_id, version_spec, instant_execution=instant_execution, no_deps=no_deps, return_postinstall=return_postinstall)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-07-26T17:27:20.038136 - 2025-07-26T17:27:20.038136 -   File "C:\Users\ADMIN\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\custom_nodes\ComfyUI-Manager\glob\manager_core.py", line 1240, in cnr_install
    manager_downloader.download_url(node_info.download_url, get_default_custom_nodes_path(), archive_name)
2025-07-26T17:27:20.038136 - 2025-07-26T17:27:20.038136 -   File "C:\Users\ADMIN\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\custom_nodes\ComfyUI-Manager\glob\manager_downloader.py", line 58, in download_url
    return torchvision_download_url(model_url, model_dir, filename)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-07-26T17:27:20.038136 - 2025-07-26T17:27:20.044589 -   File "C:\Users\ADMIN\Documents\ComfyUI\.venv\Lib\site-packages\torchvision\datasets\utils.py", line 121, in download_url
    url = _get_redirect_url(url, max_hops=max_redirect_hops)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-07-26T17:27:20.044589 - 2025-07-26T17:27:20.044589 -   File "C:\Users\ADMIN\Documents\ComfyUI\.venv\Lib\site-packages\torchvision\datasets\utils.py", line 66, in _get_redirect_url
    with urllib.request.urlopen(urllib.request.Request(url, headers=headers)) as response:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-07-26T17:27:20.044589 - 2025-07-26T17:27:20.045554 -   File "C:\Users\ADMIN\AppData\Roaming\uv\python\cpython-3.12.9-windows-x86_64-none\Lib\urllib\request.py", line 215, in urlopen
    return opener.open(url, data, timeout)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-07-26T17:27:20.045554 - 2025-07-26T17:27:20.046680 -   File "C:\Users\ADMIN\AppData\Roaming\uv\python\cpython-3.12.9-windows-x86_64-none\Lib\urllib\request.py", line 521, in open
    response = meth(req, response)
               ^^^^^^^^^^^^^^^^^^^
2025-07-26T17:27:20.047818 - 2025-07-26T17:27:20.047818 -   File "C:\Users\ADMIN\AppData\Roaming\uv\python\cpython-3.12.9-windows-x86_64-none\Lib\urllib\request.py", line 630, in http_response
    response = self.parent.error(
               ^^^^^^^^^^^^^^^^^^
2025-07-26T17:27:20.048813 - 2025-07-26T17:27:20.048813 -   File "C:\Users\ADMIN\AppData\Roaming\uv\python\cpython-3.12.9-windows-x86_64-none\Lib\urllib\request.py", line 559, in error
    return self._call_chain(*args)
           ^^^^^^^^^^^^^^^^^^^^^^^
2025-07-26T17:27:20.049372 - 2025-07-26T17:27:20.049732 -   File "C:\Users\ADMIN\AppData\Roaming\uv\python\cpython-3.12.9-windows-x86_64-none\Lib\urllib\request.py", line 492, in _call_chain
    result = func(*args)
             ^^^^^^^^^^^
2025-07-26T17:27:20.049732 - 2025-07-26T17:27:20.049732 -   File "C:\Users\ADMIN\AppData\Roaming\uv\python\cpython-3.12.9-windows-x86_64-none\Lib\urllib\request.py", line 639, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
2025-07-26T17:27:20.049732 - 2025-07-26T17:27:20.049732 - urllib.error.HTTPError: HTTP Error 404: Not Found
2025-07-26T17:27:20.049732 - 2025-07-26T17:27:20.049732 - 
[ComfyUI-Manager] Queued works are completed.
{'install': 1}
2025-07-26T17:27:20.049732 - 
After restarting ComfyUI, please refresh the browser.
2025-07-26T17:27:23.178823 - FETCH ComfyRegistry Data: 5/922025-07-26T17:27:23.178823 - 
2025-07-26T17:27:27.790755 - got prompt
2025-07-26T17:27:27.790755 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#16'", 'extra_info': {}}
2025-07-26T17:27:28.243401 - FETCH ComfyRegistry Data: 10/922025-07-26T17:27:28.243401 - 
2025-07-26T17:27:33.007739 - FETCH ComfyRegistry Data: 15/922025-07-26T17:27:33.007739 - 
2025-07-26T17:27:38.114820 - FETCH ComfyRegistry Data: 20/922025-07-26T17:27:38.114820 - 
2025-07-26T17:27:43.332509 - FETCH ComfyRegistry Data: 25/922025-07-26T17:27:43.332509 - 
2025-07-26T17:27:48.458957 - FETCH ComfyRegistry Data: 30/922025-07-26T17:27:48.459963 - 
2025-07-26T17:27:53.428715 - FETCH ComfyRegistry Data: 35/922025-07-26T17:27:53.428715 - 
2025-07-26T17:27:58.376012 - got prompt
2025-07-26T17:27:58.376012 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#16'", 'extra_info': {}}
2025-07-26T17:27:58.512958 - FETCH ComfyRegistry Data: 40/922025-07-26T17:27:58.512958 - 
2025-07-26T17:28:02.895275 - FETCH ComfyRegistry Data: 45/922025-07-26T17:28:02.896267 - 
2025-07-26T17:28:07.814188 - FETCH ComfyRegistry Data: 50/922025-07-26T17:28:07.814188 - 
2025-07-26T17:28:12.863725 - FETCH ComfyRegistry Data: 55/922025-07-26T17:28:12.863725 - 
2025-07-26T17:28:17.672811 - FETCH ComfyRegistry Data: 60/922025-07-26T17:28:17.672811 - 
2025-07-26T17:28:21.179531 - got prompt
2025-07-26T17:28:21.180529 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#16'", 'extra_info': {}}
2025-07-26T17:28:22.536283 - FETCH ComfyRegistry Data: 65/922025-07-26T17:28:22.536283 - 
2025-07-26T17:28:28.414698 - FETCH ComfyRegistry Data: 70/922025-07-26T17:28:28.414698 - 
2025-07-26T17:28:33.504297 - FETCH ComfyRegistry Data: 75/922025-07-26T17:28:33.504297 - 
2025-07-26T17:28:39.193024 - FETCH ComfyRegistry Data: 80/922025-07-26T17:28:39.193956 - 
2025-07-26T17:28:43.985733 - FETCH ComfyRegistry Data: 85/922025-07-26T17:28:43.985733 - 
2025-07-26T17:28:48.828842 - FETCH ComfyRegistry Data: 90/922025-07-26T17:28:48.830068 - 
2025-07-26T17:28:51.604363 - FETCH ComfyRegistry Data [DONE]2025-07-26T17:28:51.604363 - 
2025-07-26T17:28:51.804224 - [ComfyUI-Manager] default cache updated: https://api.comfy.org/nodes
2025-07-26T17:28:51.864875 - nightly_channel: 2025-07-26T17:28:51.864875 - 
2025-07-26T17:28:51.864875 - https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/remote2025-07-26T17:28:51.864875 - 
2025-07-26T17:28:51.864875 - FETCH DATA from: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/custom-node-list.json2025-07-26T17:28:51.864875 - 2025-07-26T17:28:51.917457 -  [DONE]2025-07-26T17:28:51.917457 - 
2025-07-26T17:28:51.969540 - [ComfyUI-Manager] All startup tasks have been completed.
2025-07-26T17:29:26.755675 - got prompt
2025-07-26T17:29:26.756675 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#16'", 'extra_info': {}}

Attached Workflow

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

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S&R":"PreviewImage"},"widgets_values":[]},{"id":18,"type":"PreviewImage","pos":[1476,143],"size":[713.2068481445312,862.2334594726562],"flags":{},"order":11,"mode":0,"inputs":[{"localized_name":"images","name":"images","type":"IMAGE","link":15}],"outputs":[],"properties":{"cnr_id":"comfy-core","ver":"0.3.45","Node name for S&R":"PreviewImage"},"widgets_values":[]},{"id":5,"type":"KSamplerSelect","pos":[489,645],"size":[315,58],"flags":{},"order":1,"mode":0,"inputs":[{"localized_name":"sampler_name","name":"sampler_name","type":"COMBO","widget":{"name":"sampler_name"},"link":null}],"outputs":[{"localized_name":"SAMPLER","name":"SAMPLER","type":"SAMPLER","links":[6]}],"properties":{"cnr_id":"comfy-core","ver":"0.3.45","Node name for S&R":"KSamplerSelect"},"widgets_values":["dpmpp_2m_sde"]},{"id":16,"type":"ReActorFaceSwap","pos":[878,133],"size":[315,290],"flags":{},"order":10,"mode":0,"inputs":[{"name":"input_image","type":"IMAGE","link":13},{"name":"source_image","type":"IMAGE","link":14},{"name":"face_model","type":"FACE_MODEL","link":null}],"outputs":[{"name":"IMAGE","type":"IMAGE","links":[15],"slot_index":0,"shape":3},{"name":"FACE_MODEL","type":"FACE_MODEL","links":null,"shape":3}],"properties":{"Node name for 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Additional Context

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

Logs

Other

No response

[ltdrdata]

You need to install ComfyUI-ReActor nodepack.
https://github.com/Gourieff/ComfyUI-ReActor#installation

If you're still encountering this error even after attempting installation, it means the installation has failed. Please follow the link above and carefully review the installation guide.

[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.