Error 0x80072178

Value: -2147016328 | 0x80072178 | 2147950968

What does it mean ?

ERROR_DS_LOW_DSA_VERSION  
The functional level of the domain (or forest) cannot be raised to the requested value, because there exist one or more domain controllers in the domain (or forest) that are at a lower incompatible functional level.
Value: 8568 | 0x2178 | 0b0010000101111000

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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