When trying to connect on my android phone I got that same screen. That app has never worked for me on Android; reviews I read complained about that problem. My guess is that app is just filled with bugs.
Pretty sure the app broke a while ago, when we updated to the new VB version, and then probably stayed broke when we reverted back to a previous version of VB as well.
I just use a browser app; could always try ForumRunner or Tapatalk.
The app works fine on my mobile phone and did on my previous mobile phone.
I will go and test it on my tablet in a second and see if I get the same problem.
Which version of Android are you running and how are you connected to the internet ?