Seaquel
SQL Server error code

SQL Server error 6544

SQL Server raises error 6544 at severity 16, which marks a problem with the query or data that you can correct.

%s ASSEMBLY for assembly '%.*ls' failed because assembly '%.*ls' is malformed or not a pure .NET assembly. %.*ls
Msg6544
Severity16
Group6000–6999

Source: Database Engine events and errors