Hey there.
I'm using version 12.33.
I appreciate you replying to me. It was happening after I attempted to reverse any clip within the video then trying to export the video.
At the time, I had already tried what you suggested before hand. It would still give the same error.
I went to try and re-create the issue just now and suddenly it's fine. And it's not like I tried it once and gave up. I tried it for about 30m approximately 24 hours ago. Turned off the computer, came back 6 hours ago. Was working on the issue for about an hour and a half and could not get it to work. The issue was also happening when I tried adding transitions between clips.
I don't understand. But I guess its fixed by itself now? Thanks.