Caw FAQ's........Links to Tutorials, and Resources. Textures, & Troubleshooting

I have a new problem now. I hadn't used CAW in several weeks, but today decided to finish up a world I'd been working on. But when I went to open the file I got an error message that says "cannot load a packed file {0}". What does that mean? I recently installed some mods, and also added the latest version of TS3 to my DEP exception list, would either of these have anything to do with it?

Thanks.