<Attempt to collect twice from pageEventFlow, whic...

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Attempt to collect twice from pageEventFlow, which is an illegal operation. Did you forget to call Flow&lt;PagingData&lt;*&gt;&gt;.cachedIn(coroutineScope)?
when I click on my back button in my project, I get an error like this, how can I solve it?
**Attempt to collect twice from pageEventFlow, which is an illegal operation. Did you forget to call Flow.cachedIn(coroutineScope)?
at app.ui.home.HomeFragment.onViewCreated$lambda-1(HomeFragment.kt:78)
**
MyCode :
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
viewModel.lastDocument.observe(viewLifecycleOwner) {...