Not even 15 minutes of working

I downloaded this because our MLB team had a deal where if you had the app you could get something free if they hit a home run. I downloaded the app and went to McDonalds, excited for my Fanta Blue Raspberry freeze. Except when I got to the restaurant about 10 minutes later, the app wouldnt load any of the deals. I let it go and figured something was wrong with my signal at the restaurant. Now Im back in my office and I cant even log into the app. It doesnt matter how I try, Facebook, Google, or my own email I get an error about malformed data. Uninstalling and re-downloading doesnt help. Its safe to say I wont be using this ever again considering it didnt even work for 15 minutes.

Data_Wrangler about McDonald's, v5.5.1