A little bit of trial and error with some logic, to be honest. It looked like your Wx sheets were pretty much copies of each other so I deleted all but one of them to start with. Then when I deleted the last one, all the errors went away so I knew there was an issue on there. That was when the trial and error part came in - I just started going through the formula cells row by row until I noticed the problem.

By the way, if you're going to cross-post the same question in several forums, you're supposed to provide links in each one.