I have been trying to start editing this project for 2 or 3 hours now and nothing I have done has worked. I opened Premiere Pro, and it said the Media was Pending. I waited for it to load but nothing happened. Then when I tried clicking play on a clip, the media window stopped displaying the "Media Pending" message and instead displayed a completely black window. Additionally, whenever I clicked play at the beginning of the program, it went forward one frame in the timeline and then stopped. I looked up several tutorials, tried many things that did not work, and eventually found a video by MarekTech, a supposed Adobe Product Expert, and he said in the video that I should ctrl+shift+option (since I'm using a Mac) and then open Premiere Pro. I held down those keys and opened Premiere Pro and then clicked yes to the popup that asked if I was sure I wanted to delete my unused cache files and Premiere Pro opened. Unfortunately, all the projects that I had put my time and effort into are now gone because I'm pretty sure it incorrectly deleted them, I don't know how to get them back, and I just want to fix my original problem and finish editing my video.
Note: the original project was 1 hour long and I was trying to edit it down to 5 or 10 minutes but now I don't know how to.