Error 0xC800041D

Value: -939523043 | 0xC800041D | 3355444253

What does it mean ?

hrNullKeyDisallowed  
Null keys are not allowed on an index.
Value: 1053 | 0x041D | 0b0000010000011101

Where does it come from ?

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

Other Errors for FACILITY_NTDSB