Seaquel
SQL Server error code

SQL Server error 5118

SQL Server raises error 5118 at severity 16, which marks a problem with the query or data that you can correct.

The file "%ls" is compressed but does not reside in a read-only database or filegroup. The file must be decompressed.
Msg5118
Severity16
Group5000–5999

Source: Database Engine events and errors