Nested While Loop MathCAD Prime

Hi,

I am trying to create a nested while loop in Mathcad prime that takes previously identified matrices (global, outside the loop) and augments them until the variable b_uc_cp in the third row of the matrix converges (<5% change).

The while statement itself has a try/on error statement because for initial cases, the criteria would have a divide by zero error.

I have been having issues with this loop, and am wondering if anyone here might have any solutions?

Thank-you so much!