My goal
I want to create a radial array of columns like in this screenshot:

Tutorial that I am following
Blender 2.8 Array Modifier Rotate video on YouTube.
My steps
- I've create a single column object:

- I've create a plain axis:

- Added «Array» modifier to the column:

- Set «Relative Offset» to
(0, 0, 0):

- But when I set «Object Offset» around the plain axis, I get this:

What I do wrong? I can not understand what I missed.

