Drupal\background_image\Controller\BackgroundImageCssController::__construct(): Argument #7 ($cache) must be of type Drupal\Core\Cache\Cache, Drupal\Core\Cache\CacheFactory given

It looks like the 2.0.x-dev version fixes the TypeError issue (although it would be better to use CacheFactoryInterface instead of CacheFactory). Have you tried that version?

That moved me forward. However, it still wasn't working.

I now have it working using the patch in this issue: https://www.drupal.org/project/background_image/issues/3370488#comment-1... 🐛 Error downloading CSS on sites without the Language module Fixed

I am working on it.

Issue is fixed, Please review.

The comment that the Interface should be used is totally right. I applied a fix for this in dev separately to this patch but will still give credit here.

Thanks!

Automatically closed - issue fixed for 2 weeks with no activity.