How did this happen?

so, i was making the pixel art for a character, then the site crashed and i had to reload, but when i did, this error popped up and it wouldn’t let me export the game, help please i don’t want to have to restart this whole game again.

Solution and some things to point out:

  1. Is the pixel art website piskel? So, avoid using ctrl z, because it crashes the website.
  2. Open the project, check the Resources tab, and delete all the images with these names or a missing icon.
  3. Save the project, re-open it and see if any error still occurs.
  4. If any error occurs, do step 2 again.