I know I read this somewhere in one of the tutorials... but i can't seem to find it anymore. When I first tried to make a mod, it didn't seem to be taking so I changed the original asset files... but now that I figured out how to override the files correctly I can't find the information that explained out to revert all your files to their original contents... I have the steam version.
Its not easy unerstanding you, but im guessing you overwrote the files in the vanlillia content folder? If so right click on the game in steam and verify local files