The layout in layout has no declaration in the base layout folder [error]

Question

After migrating to Android Studio 3.2, API 28, I am getting the following error on my app\'s layout:

The layout in layout has no declaration in the base lay

Answer 1

In my case, this issue was caused by Uppercase letter. Wrong chars like "-" can also cause the issue. I changed the name from Activity_disease.xml to activity_disease.xml and the issue fixed.