PayPal Express error

[budy]

Well, I finally sorted this problem out, there were two things which have to be put in place. In the PayPal side to remove all previous postage calculations, and in the admin side in configuration / My store / cURL proxy status to false.

Now this may seem a bit silly after all. Well I'd like to thank you for trying to help.

[DrByte]

Well, I finally sorted this problem out, there were two things which have to be put in place. In the PayPal side to remove all previous postage calculations

That's only necessary if you're using Website Payments Standard.
Express Checkout ignores any postage rules you've configured in your PayPal account.

and in the admin side in configuration / My store / cURL proxy status to false.

Yes, that's right. It's very rare to need a CURL proxy anymore. In fact, it was only ever GoDaddy who ever needed it, and that was just one of their many stupid hosting ideas. At least they've corrected that one, even though they have many more to fix.