Error 0x800721A3

Value: -2147016285 | 0x800721A3 | 2147951011

What does it mean ?

ERROR_DS_WKO_CONTAINER_CANNOT_BE_SPECIAL  
The target container for a redirection of a well known object container cannot already be a special container.
Value: 8611 | 0x21A3 | 0b0010000110100011

Where does it come from ?

FACILITY_WIN32  
Provides a way to handle error codes from functions in the Win32 API as an HRESULT. (Error codes in 16 - bit OLE that duplicated Win32 error codes have also been changed to FACILITY_WIN32)
Value: 7 | 0x007 | 0b00000111

Other Errors for FACILITY_WIN32