Error 0xC8000645

Value: -939522491 | 0xC8000645 | 3355444805

What does it mean ?

hrKeyDuplicate  
The key already exists.
Value: 1605 | 0x0645 | 0b0000011001000101

Where does it come from ?

FACILITY_NTDSB  
Active Directory Domain Services
Value: 2048 | 0x800 | 0b100000000000

Other Errors for FACILITY_NTDSB