Seaquel
SQL Server error code

SQL Server error 4504

SQL Server raises error 4504 at severity 16, which marks a problem with the query or data that you can correct.

Could not create %S_MSG '%.*ls' because CLR type '%.*ls' does not exist in the target database '%.*ls'.
Msg4504
Severity16
Group4000–4999

Source: Database Engine events and errors