Can't edit my lists

For a month I have been trying to edit my Pull-List and some other lists of mine but when I click Save List it doesn't work at all.The window which says ''Ooooops!Something went horribly wrong!'' appears and my list can't be editted.I tried to do it again a few days ago and it is still like that.

Can you help me by telling me why is this happening or how can I fix it.

@tdk_1997: Firefox? it has been working for a while if you are using Chrome, if you are using Chrome and it isn't working try clearing your cache.

@pikahyper: I'm on Chrome and I will try to clear my cache and see if it will work.