Seaquel
SQL Server error code

SQL Server error 6261

SQL Server raises error 6261 at severity 16, which marks a problem with the query or data that you can correct.

The CLR type referenced by column "%.*ls" of table variable "%.*ls" has been dropped during the execution of the batch. Run the batch again.
Msg6261
Severity16
Group6000–6999

Source: Database Engine events and errors