"Communication problem" happens when the phone can't establish Internet connection.
As you suspected, it usually happens due to incorrect WEB settings.
You should contact your cellular operator's support, and ask them to provide the optimal settings for using amAze, since it changes from one operator to another, and from one model to another
You can also visit the amAze forum,
a) because you'll find many interesting things there.
b) You might find help with settings.
c) amAze team can help and support if you have any other questions.