What have you tried?
Which blocks do you use?
And on which step did you get the error message?
Do you get it as apk or on companion?
when i back press on screen1
Why do you want to open screen 1 again, if a user clicked on “No” ?
I mean you are already on screen 1 or not?
yes but if user click on no then show a blank white screen to user…
so i am open screen 1 again
When click no, just do nothing, because you are already on screen1
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switch screen correctly 
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