Ora: 00903 -Invalid table name- ASP.net - gridview

I have a oracle database, with 2 tables, and I want to display data from tables in GridView in ASP,net web app, but then I create the DataSouce and I get "Test Query", a get the error "ora: 00903 Invalid table name" When I am created the connection, I am tested the connection, and it work. In SQL- command promt the command "Select * form table_name" work correct. Thank you!