can't use the help docements about matlab2015a

Hi, dear, I can't use doc help documents when I use the matlab 2015a on the win7 system, everytime when I use the doc command, the error will happen like this:

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: Could not initialize class com.mathworks.mlwidgets.help.ProductFilterModel$InstalledState
  Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: Could not initialize class com.mathworks.mlwidgets.help.ProductFilterModel$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.mlwidgets.help.HelpPopup.createHelpPanel(HelpPopup.java:461)
    at com.mathworks.mlwidgets.help.HelpPopup.createComponents(HelpPopup.java:451)
    at com.mathworks.mlwidgets.help.HelpPopup.<init>(HelpPopup.java:447)
    at com.mathworks.mlwidgets.help.HelpPopup.getInstance(HelpPopup.java:428)
    at com.mathworks.mlwidgets.help.HelpPopup.closeIfShowingWithDifferentParent(HelpPopup.java:273)
    at com.mathworks.mlwidgets.help.HelpPopup.showHelp(HelpPopup.java:386)
    at com.mathworks.mlwidgets.help.HelpPopup.showHelp(HelpPopup.java:347)
    at com.mathworks.mlwidgets.help.HelpPopup.showHelp(HelpPopup.java:210)
    at com.mathworks.mde.editor.plugins.matlab.MatlabSelectionDelegate$2.run(MatlabSelectionDelegate.java:198)
    at java.awt.event.InvocationEvent.dispatch(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.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 figure it out? please help me

Answer 1

[Marc Jakobi]

It sounds like a currupt Matlab installation. I would suggest you reinstall Matlab and if the problem still persists, call the Mathworks support.

[Ermin Gong]

Yeah, I have reinstalled it, and the problem still there, I give it up, it spent much time till now, I have to! Still thank you very much

[Marc Jakobi]

Try restoring Matlab's search path to the default. You may have duplicate functions that are shadowing Matlab's internal functions. If the problem still persists, you should be eligible for free telephone support.

Answer 2

[Walter Roberson]

See http://www.mathworks.com/matlabcentral/answers/232238-java-error-when-using-fx-button#answer_188221

[Ermin Gong]

Yeah, thank you first, this page you attached i had seen, and following his step operation, however, it still doesn't work, what a pity!