Without Meyer, No Celebration is Complete (German: Keine Feier ohne Meyer) is a 1931 German comedy film directed by Carl Boese and starring Sig Arno, Ralph Arthur Roberts and Dina Gralla. Boese made a number of films featuring Jewish comedians during the Weimar Era. Using only the above description and what you know about the world, "Ralph Arthur Roberts is an actor" is definitely correct, incorrect, or inconclusive? 