Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "kp_get_client_id" not found or invalid function name in /srv/users/raceskin/apps/raceskin/public/wp-includes/class-wp-hook.php:308 Stack trace: #0 /srv/users/raceskin/apps/raceskin/public/wp-includes/plugin.php(205): WP_Hook->apply_filters('', Array) #1 /srv/users/raceskin/apps/raceskin/public/wp-content/plugins/klarna-onsite-messaging-for-woocommerce/klarna-onsite-messaging-for-woocommerce.php(260): apply_filters('kosm_data_clien...', '') #2 /srv/users/raceskin/apps/raceskin/public/wp-content/plugins/klarna-onsite-messaging-for-woocommerce/klarna-onsite-messaging-for-woocommerce.php(80): Klarna_OnSite_Messaging_For_WooCommerce->set_data_client_id() #3 /srv/users/raceskin/apps/raceskin/public/wp-includes/class-wp-hook.php(308): Klarna_OnSite_Messaging_For_WooCommerce->init('') #4 /srv/users/raceskin/apps/raceskin/public/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array) #5 /srv/users/raceskin/apps/raceskin/public/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #6 /srv/users/raceskin/apps/raceskin/public/wp-settings.php(486): do_action('plugins_loaded') #7 /srv/users/raceskin/apps/raceskin/public/wp-config.php(96): require_once('/srv/users/race...') #8 /srv/users/raceskin/apps/raceskin/public/wp-load.php(50): require_once('/srv/users/race...') #9 /srv/users/raceskin/apps/raceskin/public/wp-blog-header.php(13): require_once('/srv/users/race...') #10 /srv/users/raceskin/apps/raceskin/public/index.php(17): require('/srv/users/race...') #11 {main} thrown in /srv/users/raceskin/apps/raceskin/public/wp-includes/class-wp-hook.php on line 308