Seaquel
SQL Server error code

SQL Server error 8906

SQL Server raises error 8906 at severity 16, which marks a problem with the query or data that you can correct.

Page %S_PGID in database ID %d is allocated in the SGAM %S_PGID and PFS %S_PGID, but was not allocated in any IAM. PFS flags '%hs'.
Msg8906
Severity16
Group8000–8999

Source: Database Engine events and errors