Eraser Tool not working

I was making some pixel art for a competition but when I selected the eraser tool, it was not erasing the stuff I made(I always use transparent background). But when I undo to erase it, it shows “Undid Eraser Tool”. Please help there is a competition tomorrow of mine.

  1. Make sure you’re erasing on the correct layer
  2. Make sure the opacity of your eraser is not 0
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