Thank you for your question. Have you added a paypal. Have you tried adding a paypal button first before testing it?
Also, here is a link to our guide on setting up paypal with Prestashop. I recommend testing in debug mode and sandbox mode to see if it provides more specific information.
If it works in sandbox mode, then I recommend checking your acount settings with paypal, to ensure it is set up correctly.
If you have any further questions feel free to post them below, or contact live support.
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