recyclerview No adapter attached; skipping layout

Question

Just implemented RecyclerView in my code, replacing ListView.

Everything works fine. The data is displayed.

But error messages are

Answer 1

In my case it happened cause i embedded a RecyclerView in a LinearLayout.

I previously had a layout file only containing one root RecyclerView as follows

I believe the problem is within the 3 lines separated. Anyway, I think its a simple problem, ill be working on it tomorrow; thought i should write what i found before forgetting about this thread.