Fatal error: Uncaught Error: Call to a member function add_cap() on null in /usr/www/users/spurwi/wp-content/plugins/ultimate-product-catalogue/ultimate-product-catalogue.php:368 Stack trace: #0 /usr/www/users/spurwi/wp-includes/class-wp-hook.php(287): ewdupcpInit->add_capabilities(false) #1 /usr/www/users/spurwi/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array) #2 /usr/www/users/spurwi/wp-includes/plugin.php(484): WP_Hook->do_action(Array) #3 /usr/www/users/spurwi/wp-admin/includes/plugin.php(701): do_action('activate_ultima...', false) #4 /usr/www/users/spurwi/wp-content/plugins/ultimate-product-catalogue/UPCP_Main.php(18): activate_plugin('ultimate-produc...') #5 /usr/www/users/spurwi/wp-settings.php(388): include_once('/usr/www/users/...') #6 /usr/www/users/spurwi/wp-config.php(90): require_once('/usr/www/users/...') #7 /usr/www/users/spurwi/wp-load.php(37): require_once('/usr/www/users/...') #8 /usr/www/users/spurwi/wp-blog-header.php(13): require_once('/usr/www/users/...') #9 /usr/www/users/spu in /usr/www/users/spurwi/wp-content/plugins/ultimate-product-catalogue/ultimate-product-catalogue.php on line 368