Why do I receive Java exception errors when I access "Version information" pane in the "History" tab under Model Properties?

I opened a Simulink model, opened "File -> Model Properties", and selected the "History" tab. Under the "Version information" pane, I selected "Edit format strings" in the pull down menu, then selected "View current values" in the pull down menu. I received the following errors:

 ??? Java exception occurred: 

 java.lang.NullPointerException

 at com.mathworks.mwt.MWUtils.contains(MWUtils.java:449)

 at com.mathworks.mwt.MWBorderLayout.getFloaterContainingRect(MWBorderLayout.java:146)

 at com.mathworks.mwt.MWFrame.update(MWFrame.java:1264)

 .

 Error in ==> D:\MATLAB6p5p1\toolbox\simulink\simulink\slmodelpropj.m (localChangeView)

 On line 347  ==> Frame.update(Frame.getGraphics)

 ??? Error while evaluating com.mathworks.mwt.MWChoice ItemStateChangedCallback.

Answer 1

[MathWorks Support Team]

This has been verified as a bug in Simulink in the way that Model Properties window handles the "Edit Format Strings" menu.

Except for the errors in the MATLAB command window, the "Model history" is displaying the correct version information every time you save the model. However, when you change back to "View current values", the "Model version" does not get updated. To get around this problem, you can select "Edit format strings" once more, then choose "View current values" again to update the "Model version".