I'm trying to either copy a list to a new board or move all the cards from a list to a list in a new board. When I try to copy the list, it creates a new list but doesn't include all the cards. When I try to move the list to the new board, it gives me a small error symbol in the bottom left corner (yellow triangle with an exclamation point inside) but no other information. Why won't it let me move my list? Could I have too many cards (around 500)?