Seaquel
SQL Server error code

SQL Server error 3036

SQL Server raises error 3036 at severity 16, which marks a problem with the query or data that you can correct.

The database "%ls" is in warm-standby state (set by executing RESTORE WITH STANDBY) and cannot be backed up until the entire restore sequence is completed.
Msg3036
Severity16
Group3000–3999

Source: Database Engine events and errors