0x00000191
ERROR_THREAD_MODE_NOT_BACKGROUND
The thread is not in background processing mode.
win32decimal 401
Matched as: the code as given (hex)
Log a case with no specific solution
Source: System Error Codes (0-499) - Win32 apps · CC-BY-4.0 (MicrosoftDocs/sdk-api, repo license verified 2026-10-09) · retrieved 2026-10-09