Can't delete the localthumbcache file

I need help deleting my localthumbcache file because it’s messing up my mods. It won’t let me delete it no matter how much I try and it just keeps saying “1 interrupted action, and unexpected error is keeping it from deleting the file, if you continue to receive this error, you can use the code to search for help with this problem” and I’m getting really mad. I’ve been trying to solve this problem for 3 days already.