wpfan

Thanks ‘ifelse’ – now it works!
If for some reason someone gets a page full of errors with the ‘rin’ theme, but all the other themes work without errors, change the following in all PHP files of the theme:

include('header.php'); --> get_header();
include('sidebar.php');--> get_sidebar();
include('footer.php'); --> get_footer();


No, I haven’t contacted them yet, as everything worked well without problems on the other themes.
(My host is https://www.all-inkl.com)