Seaquel
SQL Server error code

SQL Server error 5560

SQL Server raises error 5560 at severity 16, which marks a problem with the query or data that you can correct.

Access to the FILESTREAM tombstone table for the database '%.*ls' cannot be performed at the moment because it conflicts with another activity, such as background GC operation, backup operation, DBCC CHECK* operation or on-going snapshot creation.
Msg5560
Severity16
Group5000–5999

Source: Database Engine events and errors