Fatal error: Uncaught Error: Call to undefined method WPDesk_Tracker::add_data_provider() in /home/nipponex/public_html/wp-content/plugins/flexible-shipping/inc/wpdesk-tracker/class-wpdesk-tracker-factory.php:47 Stack trace: #0 /home/nipponex/public_html/wp-content/plugins/flexible-shipping/inc/wpdesk-tracker/class-wpdesk-tracker-factory.php(83): WPDesk_Tracker_Factory->build_tracker('flexible-shippi...') #1 /home/nipponex/public_html/wp-content/plugins/flexible-shipping/plugin-create.php(30): WPDesk_Tracker_Factory->create_tracker('flexible-shippi...') #2 /home/nipponex/public_html/wp-includes/class-wp-hook.php(286): flexible_shipping_plugins_loaded('') #3 /home/nipponex/public_html/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #4 /home/nipponex/public_html/wp-includes/plugin.php(465): WP_Hook->do_action(Array) #5 /home/nipponex/public_html/wp-settings.php(374): do_action('plugins_loaded') #6 /home/nipponex/public_html/wp-config.php(91): require_once('/home/nipponex/...') #7 /home/nipponex/publi in /home/nipponex/public_html/wp-content/plugins/flexible-shipping/inc/wpdesk-tracker/class-wpdesk-tracker-factory.php on line 47