I just tried loading the project you show and found no problem with it. A couple of things to try.
Are you upgraded to iClone 4.2? I would update if you haven't already.
Have you tried selecting New Project first then load the Project file immediately afterwards.
If you still get the same error message then I would try installing the pack again. You don't need to remove it first, just install again over the top. This may well make a difference.
Peter
Forum Administrator
www.reallusion.com