the N be that
The 'problem' group
These nouns refer to a bad aspect of a thing or situation.
catch difficulty disadvantage downside drawback problem snag trouble
The catch is that before he can hire the workers to build the housing, he has to have the housing to house the workers.
The difficulty is that scientists do not fully understand what makes volcanoes erupt.
The problem is that I like red meat in rich sauces, cream and good food. I'd rather die at 45 and enjoy myself than live on salads till I'm 65.
The trouble is that you never catch up. You are always working to pay off what you owe.