Paypal checkout problem in prestashop

[SiciliaBedda]

I have created a little e-commerce site with Prestashop 1.7.6.8 but when i test it online i have two errors. First PayPal checkout module not work aniway, i have instelles Paypal Classic module but during the Payment i have the error: Error on Paypal systems: The value of a field does not conform to the expected format. Please i'm not an expert. anyone Can help me? thanks? i'm in panic

[Amauri-Neko]

Hi. I was having the exact same problem in a new prestashop store that I was creating. But I have another store where the module works fine, so I went to the backoffice to find the version of the module. The version that works well is "v5.1.2" and it comes for "prestashop" developers (of which I have a backup in my personal repository). The version that doesn't work (at least for this new store) is "v5.3.0", the one I downloaded from the official prestashop add-ons page and it comes from "ecommerce" developers.
I hope it helps you.

[Moyses55]

¿Can you pass us the .zip of that version?

[gnsg2019]

In my prestashop 1.7.7.3 Doesn't work too.

The popup open show the Icon loading and close it alone without show anything else