Unable to load help page in MATLAB

Hi,

The help page for most commands are either blank or in plain text without correct formatting. I tried to Sign In but the button gives no response.

For the blank page, following error codes are shown.

Exception in thread "AWT-EventQueue-0": java.lang.NullPointerException
	at com.mathworks.help.helpui.DocRoot.buildDocPageUrl(DocRoot.java:44)
	at com.mathworks.help.helpui.DocPageUrlBuilder.buildDocPageUrl(DocPageUrlBuilder.java:25)
	at com.mathworks.help.helpui.DocPageUrlBuilder.buildFileUrl(DocPageUrlBuilder.java:21)
	at com.mathworks.mlwidgets.help.LightweightHelpPanel$JsHelpPanelClientRunnable.getUrlToLoad(LightweightHelpPanel.java:258)
	at com.mathworks.mlwidgets.help.LightweightHelpPanel$JsHelpPanelClientRunnable.run(LightweightHelpPanel.java:236)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

For reference, my os version is fedora 32 and

>> version -java

ans =

    'Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode'

Any idea? Thanks in advance.

[Walter Roberson]

Interestingly, this is the same error as the recent https://www.mathworks.com/matlabcentral/answers/570682-matlab-help-is-not-working?s_tid=srchtitle

[Alexander Wang]

BTW, I have no problem with Matlab on Windows.

[Pekka Mertsalmi]

I'm using Matlab on Windows 10 and catching old fashioned help page and crash report.

[Alexander Wang]

If possible plz try to upgrade to Matlab 2020a and see if problems persist. Though personally I don't think it should matter.

Answer 1

[Urmila Rajpurohith]

Hi

Refer to the below link which may help you in resolving the issue:

https://www.mathworks.com/matlabcentral/answers/423210-why-is-matlab-help-browser-showing-unformatted-text-on-linux-r2018b#answer_346722

Hope this helps!