Question: Error, bad index into Matrix

Dear all,

I cannot quite seem to figure out what it is that I am doing wrong. In the plots that I am trying to plot, I keep getting an error "Error, bad index into Matrix". I understand what the error means (having read through the webpage that it takes me to), but I cannot figure out what my mistake is. Can someone please help me understand what I am doing wrong?

Simple_Plot.mw

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