Premiere Pro: Loading Footage for Project Problem
I would try following this YouTube tutorial. What they do in it is make a new premiere pro project and then import the project into it.


                
            

Summary of video:


Open premiere pro and make a new project. 
Go to the media browser
Navigate to where your project is saved
Right click on it and press import
Check import entire project and tick Create folder for imported items and click ok
Go to the tab where it says project:[project name]
Expand the folder there
Find the file  which has a icon which looks like lots of tracks on a timeline
Drag that into the timeline
Save the new project