Coming empty string error

When I click on my first list view item and go to another screen this error coming.Also when I click side menu item same screen open again and again .Can anyone solve this ? I share the aia file .

usa (1).aia (524.9 KB)

Just post your blocks please.

blocks too much for this I share this aia. Wait giving blocks


Where did you store Point in tiny db, looks like its coming empty when you calling thats why its not adding 1000 to it, use Value if bot there to 0 instead of empty

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see also here about how to switch screens correctly App Inventor Tutorials and Examples: Manager Screen | Pura Vida Apps
see also tip 1 here
General Tips and Tricks for App Inventor/Kodular


To clarify for him




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