Paypal Express Checkout

Hello, I am having an issue with Paypal express checkout. When i attempt to pay via paypal i get the following error:

Sorry this doesn't look like a WHMCS site at https://www.hulahost.co/account/ Make sure your WHMCS Integration settings are pointing to the correct URL and that the WHMCS site is set for the Portal template in Setup | General.

Any help would be appreciated. Thanks in advance.