App not working properly

My finished app doesn't work property after downloading as APK on my phone but it worked normally on emulator before download. Pls what can I do to resolve the issue.

We really do not know.

Please give the project .aia.

Your phone started out with an empty TinyDB.
Check your default TinyDB return values, to see what effect they will have if returned.
Common errors include returning a string instead of an empty list when a list is needed.

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