Error 0x8050A002

Value: -2142199806 | 0x8050A002 | 2152767490

What does it mean ?

ERR_MP_BADDB_HEADER  
The digital signature of the definition update file is not valid. You should try to update the definitions again.
Value: 40962 | 0xA002 | 0b1010000000000010

Where does it come from ?

FACILITY_WINDOWS_DEFENDER  
Windows Defender
Value: 80 | 0x050 | 0b01010000

StackOverflow

Other Errors for FACILITY_WINDOWS_DEFENDER