title: Quickblox 422 No recipient issue using Android SDK
body: <p>I am using <code>Quickblox</code> Android Chat SDK for my chat module. I have implemented whatever the process stated in <code>Quickblox</code> Site. I was able to register,login and creating session to the <code>Quickblox</code> programmatically and able to chat and chat history successfully. I got struck for some users, I am not able to chat as I am getting <code>422 error "'{"errors":{"base":["No recipients. At least one user should be subscribed for GCM (Android Push) (through SDK or REST API)"]}}'"</code>. But for some users, I am not facing any problem. Please suggest me the solution for this problem.</p>