Does someone know why the projects I created in Final Cut Pro X Trial Version don't work in the version I just bought?

I created a lot of projects and events in the Trial version. It is said on the apple website that if I bought the regular Final Cut Pro X, I could still work on them.
But I just can't... I've tried many way, automatically by double clicking on the projects icons and manually on droping the files into FCPX, nothing works...

Can anyone help me? those projects were really important !

thanks everyone