Fatal error

Ich habe eine neue Seite aufgesetzt und versucht PodLove zu installieren. Ich bekomme leider immer einen fatal error:

Fatal error: Uncaught Error: Call to a member function add_cap() on null in /hp/cn/aa/ea/www/wordpress_new/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/includes/capabilities.php:27 Stack trace: #0 /hp/cn/aa/ea/www/wordpress_new/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/includes/capabilities.php(14): podlove_add_capability_to_roles('podlove_read_an...', Array) #1 /hp/cn/aa/ea/www/wordpress_new/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/plugin.php(14): podlove_init_capabilities() #2 /hp/cn/aa/ea/www/wordpress_new/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/plugin.php(85): Podlove\activate_for_current_blog() #3 /hp/cn/aa/ea/www/wordpress_new/wp-includes/class-wp-hook.php(292): Podlove\activate('') #4 /hp/cn/aa/ea/www/wordpress_new/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters('', Array) #5 /hp/cn/aa/ea/www/wordpress_new/wp-includes/plugin.php(484): WP_Hook->do_action(Array) #6 /hp/cn/aa/ea/www/wordpress_new/wp-admin/plugins.php(193): do_action('activa in /hp/cn/aa/ea/www/wordpress_new/wp-content/plugins/podlove-podcasting-plugin-for-wordpress/includes/capabilities.php on line 27

Ich würde mich freuen über einen Tipp, wo ich mit der Fehlersuche anfangen kann.

Danke für ein tolles Produkt.

Cheers
John