Seaquel
SQL Server error code

SQL Server error 6215

SQL Server raises error 6215 at severity 16, which marks a problem with the query or data that you can correct.

%s ASSEMBLY failed because method '%.*ls' on type '%.*ls' in %.*ls assembly '%.*ls' has invalid attribute 0x%x.
Msg6215
Severity16
Group6000–6999

Source: Database Engine events and errors