I'm getting StackOverFlowException

The call stack is a structure that keeps track of function call states. That is, every time a function gets called, the the programming language environment puts the instruction pointer and variables connected to function on the the stack as a way to keep track of the state of your program. When a function is finished, it gets taken off the stack, and you are returned to the state below it, which is almost always the function that originally called the function which just finished.

Usually, you get a stack overflow when more states are put on the stack than the stack can carry, hence it "overflows" with function states.

Since the stack is quite large, it would take a LOT of functions calling functions for that to happen... or, there's a high chance that a functions starts calling others or even itself recursively, infititely, until the stack overflows.

If you don't know which functions could be recursively calling each other, I suggest you stub the functions in one of your classes (comment them out), run the program again to make sure that the code you stubbed is what is causing the problem. Then, reintegrate each function and run so that you can locate which function is causing the overflow.