What is Unlock failed ErrCode: 80000001

[reliableservice]

Can anyone explain ?

Unlock failed ErrCode: 80000001

------------------------------------------------Log
Identifying device...
model:ST500LM034-2GH17A firmware version:LXM3 serial number:WGS5YDZR

Will use the default baud rate (38400)!

Detected ROM size:1048576 (0x100000) bytes
succeed to read Flash ROM quickly! 285996 ms
Succeed to backup ROM.
Unlock failed ErrCode: 80000001

[HddDonorMarket]

as I remember I get this error when;
If Rom unlocked before,
If Rom not need unlock ( not sure this)
If Rom cannot unlock with MRT