problem with paypal paying through website. at check out says "paypal error"

[artyomkoz]

Hello, I have a website on which customers can pay through paypal. I have changed recently the paypal account for that site - added new API data. And now whenever somebody wants to check out and pay, it says PAYPAL ERROR. Before it was perfectly alright. I need your help!

[MTS_Ciaran]

Can you post a link of where we can test this, and a screenshot of the error please?