If you're paying with PayPal, please verify that your order does NOT include any items on Autoship. Unlike credit cards, these methods of payment can't authorize future orders, so we don't accept them for the purchase of items you wish to schedule for automatic re-delivery. If you are using a credit card and are experiencing problems, please ensure your billing information is correct by visiting the manage credit card section within your online account: https://www.vitacost.com/MyAccount/Login.aspx