Help solving system of 6 equations.

I am looking for help solving a system of equations for multi-effect evaporation on Mathcad. I am relatively in experienced and despite trying for hours and being successful solving simpler equations I have been unable to solve this problem.

Mathcad is reporting an error with the solve box and I am unsure what I need to do to make this work. I've attached the mathcad file I'm trying to solve and appreciate any help.