Getting this error after running successfully for 5 Minutes

I successfully installed and setup amazon alexa and its running fine. But after 5 minutes, I am getting this error on javaclient terminal window.

15:16:03.223 [RequestThread] ERROR com.amazon.alexa.avs.ui.controllers.ListenViewController - An error occured creating speech request
com.amazon.alexa.avs.exception.AlexaSystemException: Timed out waiting for request from client
at com.amazon.alexa.avs.message.response.AlexaExceptionResponse.throwException(AlexaExceptionResponse.java:38) ~[classes/:?]
at com.amazon.alexa.avs.http.AVSClient.parseException(AVSClient.java:347) ~[classes/:?]
at com.amazon.alexa.avs.http.AVSClient.doRequestActual(AVSClient.java:315) ~[classes/:?]
at com.amazon.alexa.avs.http.AVSClient.access$200(AVSClient.java:67) ~[classes/:?]
at com.amazon.alexa.avs.http.AVSClient$2.call(AVSClient.java:235) ~[classes/:?]
at com.amazon.alexa.avs.http.AVSClient$2.call(AVSClient.java:230) ~[classes/:?]
at com.amazon.alexa.avs.http.AbstractRetryPolicy.tryCall(AbstractRetryPolicy.java:38) ~[classes/:?]
at com.amazon.alexa.avs.http.AVSClient.doRequest(AVSClient.java:242) [classes/:?]
at com.amazon.alexa.avs.http.AVSClient.access$500(AVSClient.java:67) [classes/:?]
at com.amazon.alexa.avs.http.AVSClient$RequestThread.run(AVSClient.java:585) [classes/:?]

What can I do about it?

Not supported country? https://github.com/alexa/alexa-avs-sample-app/wiki/Troubleshooting#timeout-exception