Error 0x800721A5

Value: -2147016283 | 0x800721A5 | 2147951013

What does it mean ?

ERROR_DS_EXISTING_AD_CHILD_NC  
The directory service detected a child partition below the requested partition name. The partition hierarchy must be created in a top down method.
Value: 8613 | 0x21A5 | 0b0010000110100101

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

StackOverflow

Other Errors for FACILITY_WIN32