Final Cut Pro won't open any of my projects.
I had a one month break not having time to work on my videos, during which I have updated Final Cut Pro X to version 10.1.1. Now my projects have vanished from the library, and it won't open .fcpevent or .fcpproject files. When browsing in Finder, everything looks as it always has, but Final Cut library shows only the original clips, none of the edited work. If I try to open .fcpproject file, it states that "The document “CurrentVersion.fcpproject” could not be opened. Final Cut Pro cannot open files in the “Final Cut Pro Project” format." Months of work on a sketch series has thus just disappeared, and my backups are just as useless as the originals. I'm new to Final Cut and edit videos as my hobby and don't quite understand all the features. I've got no idea what to do or try.
Final Cut Pro X, OS X Mavericks (10.9.1)