I'm trying to open up a library in Final Cut Pro , it used to work fine and now everytime i open it up it crashes the entire application , 
I have a Mac Pro running Yosemite , i tried multiple solutions as restoring it from a back up everytime i load it crashes i even tried going back 6 months ago and still it crashes , 
when i open a new library from scratch it works fine 
the only thing i didnt try is to remove the application and reinstall it , but i dont think doing that will help , please assist 
Thanks !!!