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Mixer not supported: ALSA [plughw:0,1], version 4.4.21+
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Mixer not supported: ALSA [plughw:0,1], version 4.4.21+
java.lang.IllegalArgumentException: Mixer not supported: null	at javax.sound.sampled.AudioSystem.getMixer(AudioSystem.java:239)	at robocode.dialog.PreferencesSoundOptionsTab.storePreferences(Unknown Source)	at robocode.dialog.PreferencesDialog.finishButtonActionPerformed(Unknown Source)	at robocode.dialog.WizardController.finishButtonActionPerformed(Unknown Source)	at robocode.dialog.WizardController.access$100(Unknown Source)	at robocode.dialog.WizardController$EventHandler.actionPerformed(Unknown Source)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)	at java.awt.Component.processMouseEvent(Component.java:6038)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3260)	at java.awt.Component.processEvent(Component.java:5803)	at java.awt.Container.processEvent(Container.java:2058)	at java.awt.Component.dispatchEventImpl(Component.java:4410)	at java.awt.Container.dispatchEventImpl(Container.java:2116)	at java.awt.Component.dispatchEvent(Component.java:4240)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)	at java.awt.Container.dispatchEventImpl(Container.java:2102)	at java.awt.Window.dispatchEventImpl(Window.java:2429)	at java.awt.Component.dispatchEvent(Component.java:4240)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)