Accidently delated last exceptions! HELP

A file that starts "lastexception" can be safely deleted. 

If you mean the mod called Better Exceptions, you can download it from TwistedMexi's website.

A list of broken and updated mods is at the top of this forum. You might also find How to Use Mods and CC has tips for things you've been struggling with.

Lastexceptions should be deleted, but you might want to read through them and try and find out what the culprit is. Some mod or Custom content is generating it. Most are harmless, but again there are places such as MCCommand's discord server that offer assistance. 

I really appreciate this so much! But I am still confused. I have broken mods with my UI (it is mod because it goes away when I removed my mods). But when I was deleting mc command center to update it but I accidently delated something in my mod folder called last exceptions (it had a different icon). It is gone now and I am not getting any last exception alerts anymore, I really want them and I find them very helpful. So is there anyway to get it back or to find which mods are the problems. (I also have better exceptions for my whole time with mods and I even redownloaded it after this problem. I also have read the link you sent me) Any help makes my day, thank you so much. If you need more information, just let me know.

ApplesevenTS9​ It sounds like you did, in fact, delete TwistedMexi's Better Exceptions. Make sure you've reinstalled it properly. Also, download it *only* from his website, or you can end up with an old version.