If you're receiving this error message, it is just a payment preferences setting that needs to be corrected in your PayPal account. To fix this:
- Go to www.PayPal.com and log in to your PayPal account.
- Go to 'Profile' -> 'Website Payment Preferences'.
- Scroll down to 'Encrypted Website Payments' and select 'Off' beside 'Block Non-encrypted Website Payment'.
Because the PayPal button is integrated with our encrypted Shopping Cart, and also already encrypted by PayPal, this setting is not required.