code not responding (computer should be fine)

hi,

I'm having troubles running the grasshopper code with an image sampler component that I editted (it keeps collasping from very simple actions like redefining the size of the pic). I have no previous experience and I'm afraid I messed something up with the code and made it extremely complex. 

The computers I'm working on belong to the uni. and they work fine for all other students so that shouldn't be the problem.

thank you very much for any help!!