Seaquel
SQL Server error code

SQL Server error 4978

SQL Server raises error 4978 at severity 16, which marks a problem with the query or data that you can correct.

ALTER TABLE SWITCH statement failed. The partition %d in table '%.*ls' resides in a read-only filegroup '%.*ls'.
Msg4978
Severity16
Group4000–4999

Source: Database Engine events and errors