I'm currently using Personal Edition and have run into this error with a file. This is a documented problem with Personal Edition and seems to have no concrete fix. Its root problem is the Personal Edition's restriction on opening files from more than one source. What seems to have happened to me is that Qlikview wrongly interpreted one of my own files, made on the same computer, as being "foreign." And thus prevents me from opening it. This may have been due to a changed internet connection.
I was wondering if someone with a normal license could check my file and see if it can be opened. Perhaps you could save it as a different copy, and I could download and recover it? I appreciate the help.