I'm playing around with the AVS sample app and I keep getting these exceptions. They happen with Ocean Sounds and Thunderstorm Sounds Skills. Apparently there is something wrong with the Http requests for online sound files.
From https://developer.amazon.com/public/solutions/alexa/alexa-voice-service/rest/error-codes-from-avs "Request could not be executed due to an internal service error" seems to be a server side error. I don't know if the skills are broken or if it has something to do with the client not making the request correctly.
03:13:18.458 [pool-10-thread-1] ERROR com.amazon.alexa.avs.AVSAudioPlayer - Error playing: https://alexasounds.com/audio/ocean-fade.mp3 03:13:19.836 [RequestThread] ERROR com.amazon.alexa.avs.http.AVSClient - There was a problem with the request. com.amazon.alexa.avs.exception.AlexaSystemException: Request could not be executed due to an internal service error. at com.amazon.alexa.avs.message.response.AlexaExceptionResponse.throwException(AlexaExceptionResponse.java:38) ~[classes/:?] at com.amazon.alexa.avs.http.AVSClient.parseException(AVSClient.java:323) ~[classes/:?] at com.amazon.alexa.avs.http.AVSClient.doRequestActual(AVSClient.java:291) ~[classes/:?] at com.amazon.alexa.avs.http.AVSClient.access$200(AVSClient.java:65) ~[classes/:?] at com.amazon.alexa.avs.http.AVSClient$2.call(AVSClient.java:220) ~[classes/:?] at com.amazon.alexa.avs.http.AVSClient$2.call(AVSClient.java:215) ~[classes/:?] at com.amazon.alexa.avs.http.AbstractRetryPolicy.tryCall(AbstractRetryPolicy.java:38) ~[classes/:?] at com.amazon.alexa.avs.http.AVSClient.doRequest(AVSClient.java:226) [classes/:?] at com.amazon.alexa.avs.http.AVSClient.access$400(AVSClient.java:65) [classes/:?] at com.amazon.alexa.avs.http.AVSClient$RequestThread.run(AVSClient.java:539) [classes/:?]