Error "Element linear layout must be declared"

I'd like an orientation, please, I'm a beginner in Android Studio. I have searched in many forums and many searches and found no solution for days.

When I create a file inside the drawable folder the following error occurs:

  

Element linear layout must be declared.

I noticed that this also happens when I create a folder with a file or just a file outside of the layout folder but within res . Since the files inside the layout does not happen any type of error when I create some new one.