You do not have permission to use the Customer Vault

Hi, i have issue with NMI payment gateway. At the backend when i enter my details and try to save the setting, i get an error as “You do not have permission to use the Customer Vault REFID:1281388238” and the following

Warning: Cannot modify header information – headers already sent by (output started at /home/example/public_html/domain.com/wp-content/plugins/woocommerce/includes/abstracts/abstract-wc-settings-api.php:243) in /home/example/public_html/domain.com/wp-admin/includes/misc.php on line 1284

Warning: Cannot modify header information – headers already sent by (output started at /home/example/public_html/domain.com/wp-content/plugins/woocommerce/includes/abstracts/abstract-wc-settings-api.php:243) in /home/example/public_html/domain.com/wp-admin/admin-header.php on line 9