I am trying to make 4 extra fields show when one of my radio button selections is made.  It is actually for Credit Card information.  This is what I have been trying on user input:

if (input.Payment_Choice == "Paid by Me")
 {
 show Credit_Card; Card_Number1; CVV; Expiration1;
 }
 else
 {
 hide Credit_Card; Card_Number1; CVV; Expiration1;
 }

Keep getting error message on line 1, not sure why.  

Your help on this is much appreciated!