You could be seeing this error because we require that the client use https (ssl) when connecting to our api servers. If your android device's settings or an intermediate network proxy are somehow forcing the connection back to http then you would get an error like that.
Further, the client will verify that the SSL certificate being used by the api server matches the certificate we compile into the client when we publish the app. If you have a proxy that intercepts https requests using its own certificate, then re-submits the request to our servers then those request will fail.
Any further details you can send us about your network and device configuration can help us debug your situation.
We should catch this error condition and provide a more user friendly error message.