In my case, after upgrading to new Dev Express version, the file of a form contained references to old uninstalled library version.
I had to open in code view and either correct the version to new one or delete the invalid entries.
File Load Exception: Could not load file or assembly 'Utility, Version=126.96.36.199, Culture=neutral, Public Key Token=764d581291d764f7' or one of its dependencies.
I had an old version of the dll in my Temporary ASP.
The fix seemed to be setting up project (.ipj) files (yeah, I know I should have done this from the beginning...). When attempting to open the iam file, the dialog box asks for the location of the file, but the correct file path is shown & I can see the ipt file in among all the others. only to be returned to the same query for file location. To say that this experience is frustrating is an understatement.