Re: OID out of range

tried casting to text,varchar but no luck 

select  u.relid,c.relnamespace::regnamespace::text,c.relname,now() as current_time,pg_size_pretty(pg_relation_size(c.oid)) as current_size,pg_size_pretty(u.table_size) as previous_size,pg_size_pretty(pg_relation_size(c.oid) - pg_relation_size(u.table_size)) as diff from user_tables_sizes u  join pg_class c on  u.relid::varchar=  c.oid::varchar where c.relkind='r' and c.relnamespace::regnamespace::text='rpx_reporting_stage' and  u.captured_dt::date=current_date - interval '1 days'
;


ERROR:  OID out of range