0x00000266
ERROR_NO_CALLBACK_ACTIVE
A callback return system service cannot be executed when no callback is active.
win32decimal 614
Matched as: the code as given (hex)
Log a case with no specific solution
Source: System Error Codes (500-999) - Win32 apps · CC-BY-4.0 (MicrosoftDocs/sdk-api, repo license verified 2026-10-09) · retrieved 2026-10-09