Seaquel
SQL Server error code

SQL Server error 4521

SQL Server raises error 4521 at severity 16, which marks a problem with the query or data that you can correct.

Cannot use object '%.*ls' with autodrop object attribute in schemabinding expressions because it is a system generated view that was created for optimization purposes.
Msg4521
Severity16
Group4000–4999

Source: Database Engine events and errors