Seaquel
SQL Server error code

SQL Server error 4913

SQL Server raises error 4913 at severity 16, which marks a problem with the query or data that you can correct.

ALTER TABLE SWITCH statement failed. The table '%.*ls' has clustered index '%.*ls' while the table '%.*ls' does not have clustered index.
Msg4913
Severity16
Group4000–4999

Source: Database Engine events and errors