Seaquel
SQL Server error code

SQL Server error 6248

SQL Server raises error 6248 at severity 16, which marks a problem with the query or data that you can correct.

%s failed because the type '%s' contains a method '%s' specified by SqlUserDefinedType.ValidateMethodName that does not conform to the required specification because it has an invalid signature.
Msg6248
Severity16
Group6000–6999

Source: Database Engine events and errors