Java exception error upon launch of Curve Fitting Toolbox

I'm getting the following errors when attempting to launch the curve fitting toolbox.

Warning: The following error was caught while executing 'sftoolgui.EditFitPanel' class destructor:
Error using sftoolgui.EditFitPanel/delete (line 108)
Java exception occurred:
java.lang.NullPointerException
	at com.mathworks.toolbox.curvefit.surfacefitting.SFEditFitPanel.cleanup(SFEditFitPanel.java:306)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.mathworks.jmi.AWTUtilities$Invoker$3$1.call(AWTUtilities.java:525)
	at com.mathworks.mvm.context.ThreadContext.callWithContext(ThreadContext.java:105)
	at com.mathworks.mvm.context.MvmContext.callWithContext(MvmContext.java:113)
	at com.mathworks.jmi.AWTUtilities$Invoker$3.runWithOutput(AWTUtilities.java:522)
	at com.mathworks.jmi.AWTUtilities$Invoker$2.watchedRun(AWTUtilities.java:475)
	at com.mathworks.jmi.AWTUtilities$WatchedRunnable.run(AWTUtilities.java:436)
	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)

Error in sftoolgui.FitFigure>iCreatePanels (line 217)
this.HFittingPanel = sftoolgui.EditFitPanel(this.Handle, ...

Error in sftoolgui.FitFigure (line 79)
            this = iCreatePanels(this);

Error in sftoolgui.sftool/fitAdded (line 146)
            fitFigure = sftoolgui.FitFigure(h, evt.HFitdev, []);

Error in sftoolgui.sftool>@(s,e)h.fitAdded(e) (line 83)
            h.createListener(fm, 'FitAdded', @(s, e) h.fitAdded( e ) );

Error in sftoolgui.FitsManager/newFit (line 35)
            notify (this, 'FitAdded', sftoolgui.FitEventData( hFitdev ));

Error in sftool_v1 (line 72)
    h.HFitsManager.newFit( data );

Error in cftool>iStartSFTOOL (line 51)
    application = sftool_v1( varaibles, names );

Error in cftool (line 41)
    theApplication = iStartSFTOOL( varargin, names ); 
> In sftoolgui.FitFigure>iCreatePanels (line 217)
  In sftoolgui.FitFigure (line 79)
  In sftoolgui.sftool/fitAdded (line 146)
  In sftoolgui.sftool>@(s,e)h.fitAdded(e) (line 83)
  In sftoolgui.FitsManager/newFit (line 35)
  In sftool_v1 (line 72)
  In cftool>iStartSFTOOL (line 51)
  In cftool (line 41) 
Warning: Error occurred while executing the listener callback for event FitAdded defined for class
sftoolgui.FitsManager:
Undefined function 'isnan' for input arguments of type 'string'.

Error in replace

Error in mat2str (line 101)
    values = replace(values, "'", "''");

Error in sftoolgui.util.javaNameValuePairs (line 37)
            args{end+1} = mat2str( optionValue ); %#ok<AGROW>

Error in sftoolgui.UpdateGUIVisitor>iSetFittype (line 171)
    sftoolgui.util.javaNameValuePairs(type, options), ...

Error in sftoolgui.UpdateGUIVisitor/visitLibrarySpecification (line 32)
            iSetFittype(...

Error in sftoolgui.fittypespec.LibraryCurveSpecification/accept (line 27)
            fittypeSpecificationVisitor.visitLibrarySpecification(this);

Error in sftoolgui.EditFitPanel (line 62)
            curveSpecification.accept(updateGUIVisitor);

Error in sftoolgui.FitFigure>iCreatePanels (line 217)
this.HFittingPanel = sftoolgui.EditFitPanel(this.Handle, ...

Error in sftoolgui.FitFigure (line 79)
            this = iCreatePanels(this);

Error in sftoolgui.sftool/fitAdded (line 146)
            fitFigure = sftoolgui.FitFigure(h, evt.HFitdev, []);

Error in sftoolgui.sftool>@(s,e)h.fitAdded(e) (line 83)
            h.createListener(fm, 'FitAdded', @(s, e) h.fitAdded( e ) );

Error in sftoolgui.FitsManager/newFit (line 35)
            notify (this, 'FitAdded', sftoolgui.FitEventData( hFitdev ));

Error in sftool_v1 (line 72)
    h.HFitsManager.newFit( data );

Error in cftool>iStartSFTOOL (line 51)
    application = sftool_v1( varaibles, names );

Error in cftool (line 41)
    theApplication = iStartSFTOOL( varargin, names ); 
> In sftoolgui.FitsManager/newFit (line 35)
  In sftool_v1 (line 72)
  In cftool>iStartSFTOOL (line 51)
  In cftool (line 41) 

[Oscar Andersson]

I also get the same error, did you find a solution?

[Daemonic]

Not exactly. We recently switched to an institutional licencse and the issue went away after a fresh install of the toobox with ver 2019a.

Answer 1

[Adrián Gómez]

Restore the path to default. I had the same problem and it was solved in this way.

[Daemonic]

Thank you so much!