Error when trying to establish a voice conference. This error happens always on the same PC. How to reproduce: 1- Try to establish a Voice communication. 2- When accepted the call, the following error occurs This error occours when trying to stablish a voice conference. [8:09 PM] mauricio: java.lang.NullPointerException javax.media.NoDataSourceException: Error instantiating class: com.sun.media.protocol.dsound.DataSource : java.lang.NullPointerException at javax.media.Manager.createDataSource(Manager.java:1012) at org.jivesoftware.smackx.jingle.mediaimpl.jmf.AudioChannel.createProcessor(AudioChannel.java:172) at org.jivesoftware.smackx.jingle.mediaimpl.jmf.AudioChannel.start(AudioChannel.java:113) at org.jivesoftware.smackx.jingle.mediaimpl.jmf.AudioMediaSession.startTrasmit(AudioMediaSession.java:92) at org.jivesoftware.smackx.jingle.JingleSession.triggerSessionEstablished(JingleSession.java:1078) at org.jivesoftware.smackx.jingle.IncomingJingleSession$Active.eventEnter(IncomingJingleSession.java:439) at org.jivesoftware.smackx.jingle.JingleNegotiator.setState(JingleNegotiator.java:137) at org.jivesoftware.smackx.jingle.JingleSession.setState(JingleSession.java:318) at org.jivesoftware.smackx.jingle.IncomingJingleSession$Pending.eventAck(IncomingJingleSession.java:391) at org.jivesoftware.smackx.jingle.JingleSession.dispatchIncomingPacket(JingleSession.java:406) at org.jivesoftware.smackx.jingle.JingleSession.respond(JingleSession.java:472) at org.jivesoftware.smackx.jingle.JingleSession$2.processPacket(JingleSession.java:901) at org.jivesoftware.smack.PacketReader$ListenerWrapper.notifyListener(PacketReader.java:819) at org.jivesoftware.smack.PacketReader$ListenerNotification.run(PacketReader.java:799) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907) at java.lang.Thread.run(Thread.java:619)