I have a weird error with a custom theme (called
uv_basic_theme). It ran well under Drupal 8, and now I've upgraded the site to Drupal 9. (9.4.4)
After upgrade, the status report listed this error:
1 (required) UV Basic Theme requires this module.
Yes, it says "1 (required)". What could it mean?
I already assumed some faulty line in the info.yml, but I can't see anything wrong:
name: UV Basic Theme description: Boilerplate Theme for Drupal 8 type: theme base theme: true core: 8.x core_version_requirement: ^8 || ^9 libraries: - uv_basic_theme/global-css - uv_basic_theme/global-js stylesheets-remove: - core/themes/stable/css/views/views.module.css - core/themes/stable/css/system/components/align.module.css regions: header: 'Header' highlighted: 'Highlighted' navigation: 'Main Navigation' content: 'Main Content' dependencies:  module_dependencies: 
Yes, I've added dependencies and module_dependencies to see if it would fix it but no.