Two Paypal Express Plugin errors/questions

-- url of the page with the problem -- : www.m2820.com
-- HikaShop version -- :2.3.1
-- Joomla version -- : 2.5
-- PHP version -- : x.x.x
-- Browser(s) name and version -- : Chrome
-- Error-message(debug-mod must be tuned on) -- : Error_message

Hello again, I am trying to use the Paypal Express Plugin which puts the Pay with Paypal button in my cart. If I buy a product and pay with paypal express, everything works, including passing the invoice back to Hikashop. However, I get this message whenever I complete the purchase.

Because of this, I decided to disable the plugin until I could figure out a solution. Upon disabling the plugin however, the button was still visible in my cart. I found that even while the plugin was disabled, the button would be visible unless the setting below was deselected.



The second problem is more of an FYI, since if the first problem is solved it won't matter.

Thanks

Here is a screenshot of the emails section.

And here is a screenshot of the order.