Error 0x800720C5

Value: -2147016507 | 0x800720C5 | 2147950789

What does it mean ?

ERROR_DS_AUX_CLS_TEST_FAIL  
Schema update failed: class in aux-class list does not exist or is not an auxiliary class.
Value: 8389 | 0x20C5 | 0b0010000011000101

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

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