Solution to documentation problem "Help (F1)" in Matlab R2015a

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.

[Geoff Hayes]

Which version of MATLAB are you using and what operating system?

[Mohamed Mahmoud]

@Geoff Hayes: I am using Matlab R2015a on Windows 8 32-bit. I make sure to run Matlab as an administrator when opening the program.

[Image Analyst]

I'd call them. Looks like an installation issue to me, meaning you get free telephone support.

[Mohamed Mahmoud]

@Image Analyst: I'm looking for any good suggestions to solve the problem.

[dpb]

He gave you the best one there is--call TMW for installation/startup support Monday AM...

[Mohamed Mahmoud]

@dpb: I will give it a shot and do as you and @Image Analyst said. Thanks!

[aye phyoe]

I have this problem until I have done uninstall and reinstall again. Please give me solution. I use Windows 7 32-bits and Matlab 2015a

Answer 1

[Breyner Posso]

Did you solve the problem?

[Mohamed Mahmoud]

Yes, I did. I re-installed the program and the problem didn't appear again.

[ninna tiska]

Wow, I must try this... thanks... (I hope it's work well...)