android.support.design.widget.CoordinatorLayout error

You need to use androidx component

Use

<androidx.coordinatorlayout.widget.CoordinatorLayout

Instead of

<android.support.design.widget.CoordinatorLayout

Use

<androidx.recyclerview.widget.RecyclerView

Instead of

<android.support.v7.widget.RecyclerView

Use

<com.google.android.material.appbar.AppBarLayout
<androidx.appcompat.widget.Toolbar

Instead of

<android.support.design.widget.AppBarLayout
<android.support.v7.widget.Toolbar

For FloatingActionButton use

<com.google.android.material.floatingactionbutton.FloatingActionButton

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