Seaquel
SQL Server error code

SQL Server error 1216

SQL Server raises error 1216 at severity 16, which marks a problem with the query or data that you can correct.

The DDL statement with ABORT_AFTER_WAIT = BLOCKERS option cannot be completed due to a conflicting system task. The request can abort only user transactions. Please wait for the system task to complete and retry.
Msg1216
Severity16
Group1000–1999

Source: Database Engine events and errors