Email error

When press to button buy.
How i can fix this ?

WP eCommerce 3.11.3

PHP Fatal error: Uncaught phpmailerException: Invalid address: in /var/www/appo/data/www/example.com/wp-includes/class-phpmailer.php:946\nStack trace:\n#0 /var/www/example.com/wp-includes/pluggable.php(352): PHPMailer->setFrom(”, ”, false)\n#1 /var/www/example.com/wp-content/plugins/wp-e-commerce/wpsc-includes/purchase-log-notification.class.php(286): wp_mail(‘[email protected]’, ‘Ordine pendente…’, ‘<p>Thank you, y…’, Array, Array)\n#2 /var/www/example.com/wp-content/plugins/wp-e-commerce/wpsc-includes/purchase-log.helpers.php(275): WPSC_Purchase_Log_Notification->send()\n#3 /var/www/example.com/wp-content/plugins/wp-e-commerce/wpsc-includes/purchase-log.helpers.php(185): wpsc_send_customer_email(Object(WPSC_Purchase_Log))\n#4 /var/www/example.com/wp-includes/plugin.php(524): _wpsc_action_update_purchase_log_status(’10’, 2, ‘1’, Object(WPSC_Purchase_Log))\n#5 /var/www/example.com/wp-content/plugins/wp-e-commerce/wpsc-includes/purchase-log.class.php(913 in /var/www/example.com/wp-includes/class-phpmailer.php on line 946, referer: http://example.com/products-page/checkout/