0x00000501
ERROR_ALREADY_THREAD
The current thread has already been converted from a fiber.
win32decimal 1281
Matched as: the code as given (hex)
Log a case with no specific solution
Source: System Error Codes (1000-1299) - Win32 apps · CC-BY-4.0 (MicrosoftDocs/sdk-api, repo license verified 2026-10-09) · retrieved 2026-10-09