Does anybody know what is wrong with my code

I cannot see what is wrong with this code but i can't get it to compile. when i try to compile it i get the

"Exception in thread "main" java.lang.NoClassDefFoundError:

Is this a problem with compiling or is it a code error?

Here is my code

public class IntCalc{

int value;

public IntCalc(){

value = 0;

}

public void add(int number){

value = value + number;

}

public void subtract(int number){

value = value - number;

}

public int getValue(){

return value;

}

}

Message was edited by:

SHIFTER

[648 byte] By [SHIFTERa] at [2007-10-3 7:27:47]