Seaquel
SQL Server error code

SQL Server error 9901

SQL Server raises error 9901 at severity 16, which marks a problem with the query or data that you can correct.

Full-text catalog '%ls' ('%d') in database '%ls' ('%d') is low on disk space. Pausing all populations in progress until more space becomes available. Reason code: %d. Error: %ls. To resume populations, free up disk space.
Msg9901
Severity16
Group9000–9999

Source: Database Engine events and errors