Error starting MATLAB R2015a

Hello, when i start the program appears an error window which says: "Error using eval undefined function 'workspacefunc' for input arguments of type 'struct'" and in the command window appears the following things:

Undefined function or variable 'computer'.

Error in matlabrc (line 76)
        if strncmp(computer,'PC',2)

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
  at com.mathworks.mlwidgets.graphics.ModelStateFactory.createNoSelectionModelState(ModelStateFactory.java:251)
  at com.mathworks.mlwidgets.graphics.PlotToolSetFactory$3.parseComplete(PlotToolSetFactory.java:123)
  at com.mathworks.mlwidgets.graphics.ModelStateFactory$ProductInfoListener$1$1.run(ModelStateFactory.java:1032)
  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)
com.mathworks.jmi.MatlabException: Undefined function or variable 'computer'.
  at com.mathworks.jmi.NativeMatlab.SendMatlabMessage(Native Method)
  at com.mathworks.jmi.NativeMatlab.sendMatlabMessage(NativeMatlab.java:266)
  at com.mathworks.jmi.MatlabLooper.sendMatlabMessage(MatlabLooper.java:120)
  at com.mathworks.jmi.Matlab.mtFeval(Matlab.java:1710)
  at com.mathworks.jmi.MatlabWorker.feval(MatlabWorker.java:197)
  at com.mathworks.appmanagement.GetAppInstallDirectoryWorker.doOnMatlabThread(GetAppInstallDirectoryWorker.java:20)
  at com.mathworks.appmanagement.GetAppInstallDirectoryWorker.doOnMatlabThread(GetAppInstallDirectoryWorker.java:7)
  at com.mathworks.appmanagement.AbstractAppManagementMatlabWorker.runOnMatlabThread(AbstractAppManagementMatlabWorker.java:21)
  at com.mathworks.jmi.MatlabWorker$2.run(MatlabWorker.java:79)
  at com.mathworks.jmi.NativeMatlab.dispatchMTRequests(NativeMatlab.java:475)

I don't know how to fix it and I need to use MATLAB right now, please someone help me. Thank you

Answer 1

[Fredrik Lundin]

I had the same issue. The supports sent me the answer below. My issue was number 2 and now Matlab works.

The "error using eval" can occur due to 2 reasons:

1. A permissions issue with "pathdef.m"
2. The presence of Lucid Logic VirtuMVP software

To troubleshoot this, please check the following:

1. If Lucid Logix VirtuMVP is not installed:

Then this is a path related issue that is oftentimes caused by not having the necessary permissions to the MATLAB folder. Specifically, this issue can be caused by not having the necessary permissions to the "pathdef.m". For Windows, setting the owner of the pathdef.m to Everyone and giving Everyone full control will resolve this issue for all users. Execute "which -all pathdef" in MATLAB to find the file location.

2. If you do have Lucid Logix VirtuMVP installed:

Then the VirtuMVP entry in the PATH environment variable will need to be removed ("C:\Program Files\Lucidlogix Technologies\VIRTU MVP 2.0" or any other form of VirtuMVP). This product (or at least some versions of it) is known to be incompatible with MATLAB. The incompatibility may only impact 64-bit installations, if this issue still exists.

Answer 2

[Jonas Olsen Dall]

Try running it as administrator, it worked for me.

[Wally K.]

The problem showed up for me after my license was updated. Ran as admin and it went away.

Answer 3

[David Zimmerman]

I received this same message and was told to type:

restoredefaultpath;matlabrc

and then it worked out. basically matlab shifted to some weird path and couldn't find any of its built in functions and this restores the default path.

Answer 4

[Gabriele]

I have the same problem. Have you fixed it?

Answer 5

[tao yang]

Exception in thread "QueuedMatlabWorker" java.lang.NoClassDefFoundError:

Answer 6

[tao yang]

Exception in thread "QueuedMatlabWorker" 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.DocCenterReferenceRetrievalStrategy.getInstance(DocCenterReferenceRetrievalStrategy.java:43)
  at com.mathworks.mlwidgets.help.DocCenterReferenceRetrievalStrategy.createDataRetriever(DocCenterReferenceRetrievalStrategy.java:79)
  at com.mathworks.mlwidgets.help.functioncall.MFunctionCall.getReferenceData(MFunctionCall.java:520)
  at com.mathworks.mlwidgets.help.functioncall.MFunctionCall.getSignatureString(MFunctionCall.java:489)
  at com.mathworks.mlwidgets.help.functioncall.MFunctionCall.createSignatureString(MFunctionCall.java:233)
  at com.mathworks.mde.functionhints.QueuedMatlabWorker$2.run(QueuedMatlabWorker.java:283)
  at java.lang.Thread.run(Unknown Source)

[Walter Roberson]

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

Answer 7

[Muhammad Adil Riaz]

I have same issue: it's path issue due to user account, permission you can just run as administrator to solve this problem.