Seaquel
SQL Server error code

SQL Server error 5124

SQL Server raises error 5124 at severity 16, which marks a problem with the query or data that you can correct.

The file header in '%ls' does not match the expected contents for file '%ls' of database '%ls'. The mismatch is possibly between the full-text catalog files and the related database. Perform a restore if necessary.
Msg5124
Severity16
Group5000–5999

Source: Database Engine events and errors