Seaquel
SQL Server error code

SQL Server error 3751

SQL Server raises error 3751 at severity 16, which marks a problem with the query or data that you can correct.

Cannot use SP_DROPEXTENDEDPROC or DBCC DROPEXTENDEDPROC with '%.*ls' because '%.*ls' is a %S_MSG. Use %ls.
Msg3751
Severity16
Group3000–3999

Source: Database Engine events and errors