Blank Page/Error Occurred after PayPal returns to shop website

[Leez]

Hello everyone, I am currently using Prestashop 1.6.0.11 PayPal Europe 3.11.1 After PayPal payment returns to the shop website, firstly it is a blank page, once the page is refreshed, "Error Occured" displayed on the webpage. I have turned on the debug mode, it displays the error are:

Notice: Undefined index: PAYMENTREQUEST_0_SHIPPINGAMT in /home/iheels5/public_html/modules/paypal/paypal_orders.php on line 70

Fatal error: Call to a member function getConfiguration() on a non-object in /home/iheels5/public_html/modules/ebay/ebay.php on line 1029

However payment via PayPal has completed, buyer has received the receipt from PayPal and I have received email from PayPal, and the back office shows there is an order.

Is there anyone has encountered this problem? If so, would be able to share some thought as to fix this? Thanks in advance.