Hey there! This is something that is fixed in 1.5, but not in 1.4. What happened is that you deleted a piece of clothing, didn't save and exited out of the game. When you tried to start it up again, the game tried to find the image file for the clothes you made before (since you didn't save after deleting it). What happens is the error above; it can't find the image file because it was deleted.
What you can do yourself is go to the folder it mentions and duplicate one of the images in there and rename it to the one that's missing. So it should be called "CLTH_00004.png" and then try to run the game again. Remember to save your game :)