I am also having this issue:
Warning: include(/var/sites/m/madabouthorror.co.uk/public_html/wp-content/plugins/yith-woocommerce-order-tracking/plugin-fw/templates/panel/sidebar/widgets/widgets.php): failed to open stream: No such file or directory in /var/sites/m/madabouthorror.co.uk/public_html/wp-content/plugins/yith-woocommerce-order-tracking/plugin-fw/lib/yit-plugin-panel-sidebar.php on line 278
Warning: include(): Failed opening ‘/var/sites/m/madabouthorror.co.uk/public_html/wp-content/plugins/yith-woocommerce-order-tracking/plugin-fw/templates/panel/sidebar/widgets/widgets.php’ for inclusion (include_path=’.:/usr/newage/lib/php’) in /var/sites/m/madabouthorror.co.uk/public_html/wp-content/plugins/yith-woocommerce-order-tracking/plugin-fw/lib/yit-plugin-panel-sidebar.php on line 278
Warning: array_merge(): Argument #1 is not an array in /var/sites/m/madabouthorror.co.uk/public_html/wp-content/plugins/yith-woocommerce-order-tracking/plugin-fw/lib/yit-plugin-panel-sidebar.php on line 137
