Error Message showing instead of thankyou message.

-- HikaShop version -- : 2.4.0
-- Joomla version -- : 3.3.0
-- PHP version -- : 5.6.3
-- Error-message(debug-mod must be tuned on) -- : Undefined property: plgHikashoppaymentPaypalAdvanced::$payment_params in paypaladvanced.php on line 174

I am using Paypal advanced plugin for hikashop. After redirecting back Paypal it is showing page with different error messages instead of going to the thank you page and also the confirmation email of order is not generating.

Hello,
Firstly, can you show me how did you configured your Payment method via "Hikashop->System->Payment methods->YourPaymentMethod" trough some screenshots ?
Thanks.

Here are the screenshots of configurations

Hi,

Please try to use our latest version of the plugin:

I have another question.In Paypal manager it has a field for "Enter Silent Post URL:"
I'm not sure what to put there.

Hi,

You should leave that empty. HikaShop is sending the silent Post URL automatically to PayPal at the end of the checkout so that PayPal can notify HikaShop to the current URL automatically.