Error 0x800720E1

Value: -2147016479 | 0x800720E1 | 2147950817

What does it mean ?

ERROR_DS_GCVERIFY_ERROR  
The global catalog verification failed. The global catalog is not available or does not support the operation. Some part of the directory is currently not available.
Value: 8417 | 0x20E1 | 0b0010000011100001

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