All right....I think I may need to change a computer and run it again.....But thank you very much for helping me figure out the problem.
It's more likely to be your version of Mathcad than the computer. "Invalid pointer" sounds like a bug to me.
Could you provide me the screenshot of the expression of the Imaginary part please? I think if I got the result of that, I would be able to complete my calculation......Thank you