MATLAB: 2015a help button issue

help-doc-no.class.def.found.error

Hi I am using MATLAB R2015a on windows 7 32bit. Plz guide me to solve the problem. whenever i try to use doc command in command window or click on help button icon or search using "search documentation" i get error
 for help button 
Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: Could not initialize class com.mathworks.mlwidgets.help.ProductFilterModel$InstalledState
  at com.mathworks.mlwidgets.help.DocCenterProductPrefs.getSelectedProductsFromPref(DocCenterProductPrefs.java:47)
  at com.mathworks.mlwidgets.help.DocCenterProductPrefs.getProductFilterModel(DocCenterProductPrefs.java:33)
  at com.mathworks.mlwidgets.help.DocCenterDocConfigParams.<init>(DocCenterDocConfigParams.java:37)
  at com.mathworks.mlwidgets.help.DocCenterDocConfig.getLocalConfig(DocCenterDocConfig.java:77)
  at com.mathworks.mlwidgets.help.DocCenterDocConfig.getInstance(DocCenterDocConfig.java:65)
  at com.mathworks.mde.help.DocCenterBrowserHandler.resolveHelpBrowserTaskUrl(DocCenterBrowserHandler.java:116)
  at com.mathworks.mde.help.DocCenterBrowserHandler.getUrlDisplayBehavior(DocCenterBrowserHandler.java:85)
  at com.mathworks.mde.help.DocCenterBrowserHandler.doHelpBrowserTask(DocCenterBrowserHandler.java:45)
  at com.mathworks.mde.help.DocCenterBrowserHandler.doHelpBrowserTask(DocCenterBrowserHandler.java:39)
  at com.mathworks.mde.help.DocCenterBrowserHandler.invoke(DocCenterBrowserHandler.java:342)
  at com.mathworks.mde.help.HelpBrowserBridge.invoke(HelpBrowserBridge.java:39)
  at com.mathworks.mlservices.MLHelpServices.invoke(MLHelpServices.java:38)
  at com.mathworks.mde.desk.MLDesktop$HelpProductPageAction.actionPerformed(MLDesktop.java:3084)
  at com.mathworks.mwswing.ChildAction.actionPerformed(ChildAction.java:214)
  at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
  at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
  at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
  at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
  at com.mathworks.toolstrip.components.DropDownButtonModel.originalSetPressed(DropDownButtonModel.java:31)
  at com.mathworks.toolstrip.components.SplitButtonModel.setPressed(SplitButtonModel.java:35)
  at com.mathworks.toolstrip.plaf.SplitButtonUI$MyToolstripButtonListener.mouseReleased(SplitButtonUI.java:558)
  at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
  at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
  at java.awt.Component.processMouseEvent(Unknown Source)
  at javax.swing.JComponent.processMouseEvent(Unknown Source)
  at com.mathworks.mwswing.MJButton.processMouseEvent(MJButton.java:348)
  at java.awt.Component.processEvent(Unknown Source)
  at java.awt.Container.processEvent(Unknown Source)
  at java.awt.Component.dispatchEventImpl(Unknown Source)
  at java.awt.Container.dispatchEventImpl(Unknown Source)
  at java.awt.Component.dispatchEvent(Unknown Source)
  at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
  at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
  at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
  at java.awt.Container.dispatchEventImpl(Unknown Source)
  at java.awt.Window.dispatchEventImpl(Unknown Source)
  at java.awt.Component.dispatchEvent(Unknown Source)
  at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
  at java.awt.EventQueue.access$500(Unknown Source)
  at java.awt.EventQueue$3.run(Unknown Source)
  at java.awt.EventQueue$3.run(Unknown Source)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
  at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
  at java.awt.EventQueue$4.run(Unknown Source)
  at java.awt.EventQueue$4.run(Unknown Source)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
  at java.awt.EventQueue.dispatchEvent(Unknown Source)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
  at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
  at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
  at java.awt.EventDispatchThread.run(Unknown Source)
and also for doc
>> doc
Error using doc (line 87)
Java exception occurred:
java.lang.NoClassDefFoundError: Could not initialize class
com.mathworks.mlwidgets.help.ProductFilterModel$InstalledState
  at
    com.mathworks.mlwidgets.help.DocCenterProductPrefs.getSelectedProductsFromPref(DocCenterProductPrefs.java:47)
  at
    com.mathworks.mlwidgets.help.DocCenterProductPrefs.getProductFilterModel(DocCenterProductPrefs.java:33)
  at
    com.mathworks.mlwidgets.help.DocCenterDocConfigParams.<init>(DocCenterDocConfigParams.java:37)
  at
    com.mathworks.mlwidgets.help.DocCenterDocConfig.getLocalConfig(DocCenterDocConfig.java:77)
  at
    com.mathworks.mlwidgets.help.DocCenterDocConfig.getInstance(DocCenterDocConfig.java:65)
  at
    com.mathworks.mde.help.DocCenterBrowserHandler.resolveHelpBrowserTaskUrl(DocCenterBrowserHandler.java:116)
  at
    com.mathworks.mde.help.DocCenterBrowserHandler.getUrlDisplayBehavior(DocCenterBrowserHandler.java:85)
  at
    com.mathworks.mde.help.DocCenterBrowserHandler.doHelpBrowserTask(DocCenterBrowserHandler.java:45)
  at
    com.mathworks.mde.help.DocCenterBrowserHandler.doHelpBrowserTask(DocCenterBrowserHandler.java:39)
  at
    com.mathworks.mde.help.DocCenterBrowserHandler.invoke(DocCenterBrowserHandler.java:342)
  at com.mathworks.mde.help.HelpBrowserBridge.invoke(HelpBrowserBridge.java:39)
  at com.mathworks.mlservices.MLHelpServices.invoke(MLHelpServices.java:38)

Best Answer

I don't know where your error comes from, but one thing you can do is google the command, Matlab has all the documentation online that to me is easier to navigate.
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