Seaquel
SQL Server error code

SQL Server error 6238

SQL Server raises error 6238 at severity 16, which marks a problem with the query or data that you can correct.

%s ASSEMBLY failed because field "%.*ls" in type "%.*ls" in assembly "%.*ls" has an invalid custom attribute "%.*ls".
Msg6238
Severity16
Group6000–6999

Source: Database Engine events and errors