<Data binding&amp; fragment issue android> I'm now...

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Data binding&amp; fragment issue android
I'm now trying to implement data binding for a fragment in my android studio project. I followed all the guidelines provided in official android documentation.
It builds well, but when I launch it on my emulator It throw this compilation error
Cannot inherit from final 'com.example....databinding.FragmentFoldersBinding' FragmentFoldersBinding()' has private access in 'com.example...databinding.FragmentFoldersBinding'
Cannot resolve symbol 'mAdapter'. Cannot resolve symbol 'mViewModel'
Here is...