Themes like Nexus doesn't work in drupal-8.4.2

Last year I have built a site in drupal-8.3.2 with Nexus Theme. Everything works well. Now I want to built a site in drupal-8.4.2 with the Nexus Theme. Here it doesn’t work: no pictures on the home page. I have also tried other Themes with slideshows on top. They don’t work either. Does anyone have a sugestion? Thanks!

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