Oracle Solution for Error ora-12057

ORA-12057: materialized view "string"."string" is INVALID and must complete refresh

What triggered the Error:

The status of the materialized view was INVALID and an attempt was made to fast refresh the materialized view.

What should we do to fix it:

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.