Android App does not recognize me

Options
I used the app all day today but when I went to log my dinner it kicked me out and I cannot log back in again. It says that my email is not registered. I deleted and reinstalled the app but I get the same thing. I can log in online, but I cannot get the app to recognize me at all. I even tried re-registering with the same information and it gave me an error before I was able to try my username. It would not let me past that point.