style.css error on clean installation

I made a clean installation of Hitchcock theme vers. 1.20, and when I go in the editor section I read:

“There is 1 error which must be fixed before you can update this file.
Update anyway, even though it might break your site?”

only in the style.css, other files are OK (I checked)

Installation is clean and I haven’t create any post, any page, and I haven’t edit any part of any code anywhere.
My WP version is 5.0.3

Thanks