Android : error showing related to serviceFactory.create user

trying to create android messaging app using since SDk. but messageService is not starting.

   FATAL EXCEPTION: main
   java.lang.ExceptionInInitializerError
   at com.sinch.android.rtc.internal.client.ServiceFactory.createUserAgent(ServiceFactory.java:44)
at com.sinch.android.rtc.internal.client.DefaultSinchClient.<init>(DefaultSinchClient.java:155)
at com.sinch.android.rtc.internal.client.InternalSinchClientFactory.createSinchClient(InternalSinchClie    ntFactory.java:14)

please help................................