Bevel not beveling in some cases - message is nothing selected I use blender 2.8, this is my first project.
Problem is that I can not bevel in some cases.

I'm in edit mode, I select an edge and press CTRL+B and when I try to move the mouse to bevel I receive the message "Nothing selected" like in the image.
The blender file is here.
You have 2 problems that prevent you to create any bevel:


An inner face that you need to delete.
A flipped normal, select all and press shiftN to fix it.


Now it works.