The below theme files, which are the only files I have in my theme folder called 'Lychee', throw the error (in the 'Uninstalled themes' section of /admin/appearance):
This version is not compatible with Drupal 8.x and should be replaced.
How should I resolve this? I followed this guidance: https://www.drupal.org/node/2349827
lychee.info.yml
name: Lychee
description: 'Mobile first theme.'
type: theme
core: 8.x
libraries:
- lychee/global-styling
regions:
- navbar: 'Navigation bar'
- parallax: Parallax
- content: Content
lychee.libraries.yml
global-styling:
version: 1.x
css:
theme:
assets/css/styles.css: {}