Fatal error: Uncaught Error: Call to undefined function get_rest_url() in /var/www/sirrom.dk/donpopsdk/wp-content/plugins/membership/premium/addon/wprest/class-ms-addon-wprest.php:110 Stack trace: #0 /var/www/sirrom.dk/donpopsdk/wp-includes/plugin.php(213): MS_Addon_WPRest->register(Array) #1 /var/www/sirrom.dk/donpopsdk/wp-content/plugins/membership/app/model/class-ms-model-addon.php(132): apply_filters('ms_model_addon_...', Array) #2 /var/www/sirrom.dk/donpopsdk/wp-content/plugins/membership/app/model/class-ms-model-plugin.php(456): MS_Model_Addon::get_addons() #3 /var/www/sirrom.dk/donpopsdk/wp-includes/plugin.php(503): MS_Model_Plugin->load_addons(Object(MS_Model_Plugin)) #4 /var/www/sirrom.dk/donpopsdk/wp-content/plugins/membership/app/model/class-ms-model-plugin.php(145): do_action('ms_load_member', Object(MS_Model_Plugin)) #5 /var/www/sirrom.dk/donpopsdk/wp-includes/plugin.php(503): MS_Model_Plugin->init_member('') #6 /var/www/sirrom.dk/donpopsdk/wp-settings.php(353): do_action('init') #7 /var/www/sirrom.dk/donpops in /var/www/sirrom.dk/donpopsdk/wp-content/plugins/membership/premium/addon/wprest/class-ms-addon-wprest.php on line 110