Some packs I sell are project file only, no clips included. If you encounter this error on a pack that should have clips, send me a message on discord with which project it was.

I usually edit with files all over my computer and might end up missing to add a file or two into the final zip.

It seems that this issue is caused by Twixtor, I'm unsure what causes it exactly but try updating your Twixtor. If it's still not working, just find the Twixtor effect on the clip and send it to the shadow realm. Transitions and everything besides the clip will still be in the project.