Why does error:unsupported relative file kep coming up

I’m halfway done creating my game and designed a car sprite in piskel, and after a while it suddenly says “error:unsupported file type” while loading that particular sprite.
I tried restarting the app, restarting my pc and even tried using png versions of the same sprite, but the error keeps coming up and it shows up as the gdevelop logo on preview
Any help is greatly appreciated as I’m on a time crunch