Seaquel
SQL Server error code

SQL Server error 2755

SQL Server raises error 2755 at severity 16, which marks a problem with the query or data that you can correct.

SET DEADLOCK_PRIORITY option is invalid. Valid options are {HIGH | NORMAL | LOW | [%d ... %d] of type integer}.
Msg2755
Severity16
Group2000–2999

Source: Database Engine events and errors