I need help! To my fault I cut all the folders that were of content and put it back as it was before, and now it does not work more materials! every time you drag a material to the wall becomes grigrio, and clicking the color you notice “ERROR” ¨ !!! How can I do??? Should I restore it all over again?
Have you put them into the right place again? Because otherwise you will lose references which will lead to errors.
What kind of error do you get? 