There was a problem connecting to PayPal to setup your purchase. Please try again.

I keep getting the following error message when I try to checkout using Paypal Express: There was a problem connecting to PayPal to setup your purchase. Please try again. It does not give me an error number. I know my API credentials are correct. I feel like I have tried everything! Please help! The site that I'm referring to is: caferacermag.com