Attempt to call nil

[allabovethis]

Loaded the program for the first time and it worked great. Had to move stuff around and now the program wont start. When I go to setup it says at the bottom. startup:180: attempt to call nil.

I have trashed the computer and re downloaded the code, but i get the same error and nothing on screen no matter what I do.

Any ideas? only thing i see that changed is the monitor and flux gate id's go up every time I move it. Would that have something to do with it?