How to resolve exception error

After attempting to run a program that I have remotely used, an error occurred "Exception in thread "main" java.util.InputMismatchException" during commanding the date as 11/11/2010. Why this problem occurred and which way I can solve it?
Moreover I have to do some fact which is displayed in the program as comments, but I am not capable of solving it with my own merit. Please help about this topic always accepted cordially.
