Fatal error: Uncaught Error: Call to undefined function ninja_forms_register_field() in /homepages/35/d103511566/htdocs/2017/wp-content/plugins/woo-order-field-for-ninja-forms/includes/fields/wooorders.php:25 Stack trace: #0 /homepages/35/d103511566/htdocs/2017/wp-includes/class-wp-hook.php(298): ninja_forms_register_field_wooorders('') #1 /homepages/35/d103511566/htdocs/2017/wp-includes/class-wp-hook.php(323): WP_Hook->apply_filters(NULL, Array) #2 /homepages/35/d103511566/htdocs/2017/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #3 /homepages/35/d103511566/htdocs/2017/wp-settings.php(449): do_action('init') #4 /homepages/35/d103511566/htdocs/2017/wp-config.php(89): require_once('/homepages/35/d...') #5 /homepages/35/d103511566/htdocs/2017/wp-load.php(37): require_once('/homepages/35/d...') #6 /homepages/35/d103511566/htdocs/2017/wp-blog-header.php(13): require_once('/homepages/35/d...') #7 /homepages/35/d103511566/htdocs/2017/index.php(17): require('/homepages/35/d...') #8 {main} thrown in /homepages/35/d103511566/htdocs/2017/wp-content/plugins/woo-order-field-for-ninja-forms/includes/fields/wooorders.php on line 25