ORA-12057: materialized view “string”.”string” is INVALID and must complete refresh
Cause: The status of the materialized view was INVALID and an attempt was made to fast refresh the materialized view.
Action: Perform a complete refresh of the materialized view. Check the value of the STATUS column in dba_mviews, all_mviews, or user_mviews to verify that the materialized view is VALID after the complete refresh.