failing to create materialized view

I am getting an error when creating a materialized view. the query runs successfully the creation of the materialized view is failing with the error: null value in entry: name=null [Execution ID: 01HF481H5AKCD83EG28X3H6WKT] after this failure the option of deleting the materialized view or archive the query doesn't work. when I try to change the failed mat view scheduler I get the error: Materialized view refresh schedule not found