Error problem in app installed plz solve

attach the screenshots of your blocks.

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There is no timer set therefore the app cannot stop any timers and the error occurs… Please check the flow of your app to make sure you start a timer before stopping it.

From the error message I would also think that. But though there is no Timer component in KodularC, maybe a Clock misbehaves.

What are your blocks related to clocks?
Remove all your timers from a backup version and tell us if the error sill showing.