MATLAB: Solution to documentation problem “Help (F1)” in Matlab R2015a

awt-eventqueue-0java

Every time when I press (F1) or (Help) button, this message appears:
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$Handler.actionPerformed(Unknown Source)
  at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
  at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
  at com.mathworks.toolstrip.plaf.RegularButtonUI$RegularToolstripButtonListener.mouseReleasedImpl
(RegularButtonUI.java:325)
  at com.mathworks.toolstrip.plaf.RegularButtonUI$RegularToolstripButtonListener.mouseReleased
(RegularButtonUI.java:319)
  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$200(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$1.doIntersectionPrivilege(Unknown Source)
  at java.security.ProtectionDomain$1.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$1.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)
How can I resolve this issue?
Edit: I have just checked Java installed on my laptop. I am using the latest version of it but I still have the same problem.

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