Does anyone know why i get an error with this code when i run it ??? [resolved]

[zmerlinz]

This is driving me mad, it will compile ok without any probs, but when i run it i get the following message

Exception in thread "main" java.lang.NoClassDefFoundError shop/java

here is the code that i am trying to run

/** this is the main program to be run and it is called Shop
*/

import Supplier;
//import Product;
    public class Shop {

		  public static void main(String args[])
        {

        Supplier Supplier1 = new Supplier ("Bobbies Suppliers", "\n 6 Oak Street, Aberystwyth", 123654, 123655);

        System.out.println ("This is the Shop Demo"+"\n\nit will show what supplier supplies what product");
        System.out.println ("The name of the first supplier is " + Supplier1.getTheName() + " .");
        }
}

thank you for any help with this