error message in app designer when closing app

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Hello,
I have made an App that works ok hwoever when I close my app (made in app designer), I get the following error message in the Matlab Command screen:
Invalid or deleted object.
Error in Trade_App_1/startupFcn (line 27)
app.Label_1.Text = Label_L;
Error using matlab.apps.internal.GraphicsCallbackProxy/runCallbackFunction (line 23)
Error while evaluating GraphicsCallbackProxy CallbackFcn.
Can any one help? Thx in advance
Thx
Leon
  4 Comments
Leon
Leon on 20 Jun 2022
Sorry the answer is of course for both Jan and Geoff

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Accepted Answer

Geoff Hayes
Geoff Hayes on 20 Jun 2022
@Leon - rather than using a while loop to update your label (which I suspect is the cause of the error), I recommend using a timer instead to do the work that is in the body of the while loop. You would then start the timer and then later stop the timer as the app exits. This should prevent the error from occurring.
  3 Comments
Leon
Leon on 20 Jun 2022
Thx for you answer Geoff, I will first work with to see if I can solve it. If not I will come back to you.
BR
Leon

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