MATLAB: Do I receive a Java error related to the Command History in MATLAB

colorprefcommanderrorhistoryjavaMATLABnullpointerexception

The output in the Command Window is the following:
 Exception occurred during event dispatching:
 java.lang.NullPointerException
         at 
 com.mathworks.ide.cmdline.CommandHistory$HistoryList.getCommentColorPref(CommandHistory.java:2101)
         at 
 com.mathworks.ide.cmdline.CommandHistory$HistoryList.<init>(CommandHistory.java:2087)
         at 
 com.mathworks.ide.cmdline.CommandHistory.<init>(CommandHistory.java:1488)
         at 
 com.mathworks.ide.cmdline.CommandHistory.addLine(CommandHistory.java:1135)
         at 
 com.mathworks.ide.cmdline.MatlabCommandWidget.sendCommand(MatlabCommandWidget.java:3533)
         at 
 com.mathworks.ide.cmdline.MatlabCommandWidget.doEnterKey(MatlabCommandWidget.java:4643)
         at 
 com.mathworks.ide.cmdline.MatlabCommandWidget.access$29(MatlabCommandWidget.java:4630)
         at 
 com.mathworks.ide.cmdline.MatlabCommandWidget$KeyEventHandler.doEmacsKeys(MatlabCommandWidget.java:4817)
         at 
 com.mathworks.ide.cmdline.MatlabCommandWidget$KeyEventHandler.keyPressed(MatlabCommandWidget.java:4784)
         at java.awt.AWTEventMulticaster.keyPressed(Unknown Source)
         at java.awt.AWTEventMulticaster.keyPressed(Unknown Source)
         at java.awt.AWTEventMulticaster.keyPressed(Unknown Source)
         at java.awt.Component.processKeyEvent(Unknown Source)
         at 
 com.mathworks.mwt.MWComponent.processKeyEvent(MWComponent.java:548)
 ...
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown 
 Source)
         at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
         at java.awt.EventDispatchThread.run(Unknown Source)

Best Answer

To fix the problem, you will need to regenerate your MATLAB preferences. The instructions are available at:
http://www.mathworks.com/support/bugreports/details.html?rp=250874
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