Having some problems using DMS - misconfigure the task selection rule (i guess)

testing it between 2 small rds postgres instances created source and target endpoints created a replication instances
( tested connections successfuly )

The task i run keeps failing : 
" Last Error No tables were found at task initialization. 
Either the selected table(s) or schemas(s) no longer exist or no match was found for the table selection pattern(s)."

Schemas : pg_catalog,information_schema,public

I only want to replicate a single DB called test_db

What should i use in the selection rule ?