Video Reports a Generic Error

Hello! I am a Mac user, and I am using the newest MacBook Air. I have been using Adobe Premiere Elements for a little while now, and I downloaded it on my new Mac! However, it seems as though Apple recently changed how they compress .mov files to be able to play them in the newest version of Apple's QuickTime Player. When I attempt to import my video files into the timeline on Premiere Elements, it reports a generic error. When I look at the error information, my issue says "File uses unsupported video compression type "ap4h." I had never gotten this error before! I believe that I have the most recent update, but I am not sure. What is my problem, and how should I fix this?