I am new to DNN, and I am currently using DNN Simple theme. When I was editing a page and adding a module on to it, then i decided to remove the module. After doing that I have been getting this error:
Unhandled error loading module. DotNetNuke.Services.Exceptions.ModuleLoadException: Cannot locate ContentPane for Skin

I can't use the admin or host buttons at all and it just throws that error every time I try to use the admin or host functions. How can i resolve this problem?

That error message says that the skin file you are using does not have a "Content Pane." If that were the case, I'm surprised that the site worked at all if that is the case.

How did you remove the module? How did you "edit the page."