“%@” can’t be found.

[nusu]

I have used this to simply convert my 1,3mb mp4 to gif but can't get an export, then dropped the video over and over into the app, and my disk space increased like crazy.
Then I removed the app with CleanMyMac.
Now I downloaded it again and when I tried to open it, it says:
“%@” can’t be found.

what should I do :(

[nusu]

Update: I didn't do anything but it's working right now, yet I have noticed something: When I tried to convert a 1.3mb mp4 to gif by 1100x? resolution my ssd gone crazy normally I have 66 gb of free space but when I run program for this purpose my free space reduce to 1gb