Can't access content library in iMovie 10.0.6
I have updated to OS X Yosemite and I am using iMovie 10.0.6 but there is no content library in the side bar and if I try to access it through the window button and then go to content library they are faded and I am unable to click them. Is there any way for me to fix this because I can't add baking music or title screens?
Thank you.
MacBook Pro with Retina display, iOS 7.1.2