any idea how to fix the following error?
ERR (3): Notice: Undefined index: ACK in /home/niamogr/public_html/app/code/core/Mage/Paypal/Model/Api/Nvp.php on line 981
thank you in advance.
the error is from paypal express.
we are using magento 1.4.1
any help please?
Port 443, is open for both incoming, and outgoing traffic.
our domain is https://www.niamo.gr/
please any help is appreciated.
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