prestashop 1.7.4.3. Error in Paypal

[supra72]

hello.. i am using prestaship 1.7.4.3. . 

after customer paid by paypal ...  and i can see money came in my compay paypal account and also customer received mail from paypal...

it looks all ok except the page is shwon like this error message.

 

Error in Paypal
Unexpected error occurred.

 

usally after pay by bankwire.. the page goes to order is confirmed and show order summary.

but only if the customer paid by paypal.. the page is shown as below image.

 

Please send a mail to [email protected] or reply...

Thank you.