"Debugging and troubleshooting", "List of MyChat Client errors", "Error #0302".
Error
Error #0302: invalid push token
When connecting to the server, the Android or iOS application transferred invalid token for PUSH messages. The server denied it and declined authorization.
Problem solution
This situation can happen when the client application fails, or because of external intrusion (suspecting hacking). Usually, to solve this issue, it is enough to perform the login process with updated.