Relation does not exist while scanning schema

My Postgres database is getting slow while executing some function. But another database of identical design and with more data is much faster than the first one. I have recently migrated data from MS SQL to PostgreSQL. So I have checked if there is any problem from following queries: SELECT relname AS TableName, to_char(seq_scan, '999,999,999,999') AS TotalSeqScan, to_char(idx_scan, '999,999,999,999') AS TotalIndexScan, to_char(n_live_tup, '999,999,999,999') AS TableRows, pg_size_pretty(pg_relation_size(relname :: regclass)) AS TableSize FROM pg_stat_all_tables WHERE schemaname = 'loan' AND 50 * seq_scan > idx_scan -- more then 2% AND n_live_tup > 10000 AND pg_relation_size(relname :: regclass) > 5000000 ORDER BY relname ASC; And I got the result: > ERROR: relation "mv_transaction_view" does not exist > SQL state: 42P01 What is the solution for this? I have a materialized view named mv_transaction_view.