notice on cart page on craft theme

Hi. after install commerce add to cart conformation and add a product to cart. in cart page i see bellow error Notice: Undefined index: commerce-add-to-cart-confirmation-alter in drupalexp_status_messages() (line 18 of /mydrupal/sites/all/themes/drupalexp/includes/form.inc)
Hello rfnbnk, We sorry for lalety responsive because we have not create Craft forum before, so we didn't see your post. About your issue, please send your FTP account and your server to [email protected]. We will help you to fix the issue Thank you.