Dimention problem/bug

Hello,

Each time I try to create a new dimention, it says it causes problems.. sometimes it does this for no reason, even though I've tried going into my dimention without any problems at all, but all of a sudden it says it causes problems.. I don't want to delete my dimention because I worked so hard on it. I don't know if this is a bug or if there's actually a problem with how I make my dimentions.. I would be very happy to find a solution to this problem, so if you could help me that'd be amazing!

Thanks in advance,

WelpY124