Did you get a text or E-Mail message saying this?
You will not know what the RFE is for till you recieve the actual letter..This is only a temporary setback..about 3-4 weeks..At least they are on your case. As soon as you reply you usually get the NOA-2 within a few days..
For the record....It can't be that bad...Hell....... if they approved me they will approve just about anyone..
It is a request for additional information/documents.......