Solved
First let me say that's is hard to debug a picture and that it would be far better if you would attach your Mathcad worksheet.
We don't see which part of your program throws that error and what type or dimension all you variables are of.
Is n an integer?
Its at least confusing that you use T_i as literal indexed variable as well as as vector variable.
In your loop with loop counter j you never use j - is this done on purpose?
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