How do I resolve the "AppManagementService indexing warning" while calling an app from a guide GUI?

So I have a set of guide GUI's that are already set up and are in working order. I needed to add another GUI, that would be accessed by one of the previous GUI's, to extend functionality. Based on what the new GUI needed to do I thought it may be better to attempt to use the App Designer and so far so good. I completed creating and testing the new app window and call it from the guide GUI just fine except for receiving the warning "A value of class 'appdesigner.internal.service.AppManagementService' was indexed with no subscripts specified. Currently the result of this operation is the indexed value itself, but in a future release, it will be an error."

I thought this may have something to do with how I use the app within the guide GUI but I can't seem to come up with a reason I get the warning. The biggest concern is that the end user will likely upgrade MatLab when they can and I don't want the app to stop working on them just for upgrading.

Just for reference this is how the app is being called from a guide GUI. To note as well this error is not always displayed to the command window on every run. It seems to occur fairly randomly.

myapp = NewApp();
NewApp.StartUp(setupInfo);  %Sets up values in the app and calls uiwait
if myapp.wasCanceled
    myApp.Dispose();        %Deletes the app instance without getting return values
    return;
end
newvalues = myApp.returnvalues;
myApp.Dispose();

[Khalid Rajab]

Hi Wesley,

Just wondering, did you find a solution to this?

I've come up with the same problem, and the code I'm using no long works when moving from MATLAB 2017a to 2017b.