Windows Overlapped operation errors in Manager: check the documented event-loop option
Use this path only when the complete traceback matches the relevant Windows asyncio/Manager failure. An event-loop error may also follow an earlier network exception.
Symptoms and scope
Use this path only when the complete traceback matches the relevant Windows asyncio/Manager failure. An event-loop error may also follow an earlier network exception.
Error fragments for search; IDs, values and filenames may vary:
Overlapped Object has pending operation at deallocation
Source-supported context
Manager documents windows_selector_event_loop_policy for matching Windows scenarios. That option is version- and environment-specific, not a general cross-platform asyncio fix. Source 1
Cases to distinguish
1. A particular Windows event-loop and dependency combination triggers the failure.
2. An earlier network error produces a secondary lifecycle exception.
3. The intended setting was applied to the wrong configuration or process.
Diagnostic sequence
The sequence below is an editorial procedure based on the cited context, not a diagnosis already confirmed for your environment.
Step 1. Save the full traceback and preceding errors before deciding that the event loop is the cause.
Step 2. For a matching documented version, back up the active configuration and test windows_selector_event_loop_policy=True.
Step 3. Restart the Python process, not only the browser, and repeat the operation that failed.
Step 4. Restore the original setting if it does not help; use an isolated reproduction and report the exact versions.
Completion check
Repeated restarts and relevant list/network operations work. One successful refresh alone is weak evidence.
Limitations and cautions
Do not apply this Windows-specific option to every installation or conceal the preceding exception.
Original sources
- ComfyUI Manager troubleshooting — original record checked 2026-09-21.
Localization prepared: 2026-09-22. The source-check dates above were inherited from the existing article; this translation does not claim they were all rechecked today. No GPU run, minimum-memory measurement or runtime guarantee is supplied.
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Sources & references
Localized from the existing Chinese research draft. Original source-check dates are retained; this translation is not new technical verification or a runtime test.
01ComfyUI Manager troubleshootingSource checked: 2026-09-21