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ok, I found the thing that was giving the runtime error.

For every method you call, you should not use the implicit "this." you have to write it.

That doesn't help much. I'm getting this same "runtime error" issue. Not having problems resolving problem, but understanding how this thing compiles. I even tried deleting the "public" in the main from that example to no avail.

I'm pasting the code in the textbox, so it is a single file source ...