Some trouble with procedural level generation!

Hello everyone! I just joined, you can check the introduction thread for more info bits.

I'm getting "A crash inside the runtime has been intercepted!" message and since I'd like to hear some tips and tricks on the topic I thought a new thread could work.

I thought I'd post some pictures instead of thousands of words!

This is what I have:



This is what I'm trying to get:


I hope you get the idea

This is my first time doing procedural generation and also my first time using both Array and Hash table objects. Please be gentle!

Edit: Forgot to mention that my intention is to use the data in my array for creating each tile in my level later on. Am I heading the right way?

As I'm not on my own PC I can't fully investigate it, but any crash is a bug, so submit it to the tracker.