Merchant Security Updates: Learn how security upgrades may affect your integration at the 2016-2017 Merchant Security Roadmap Microsite
Payments Standard Updates: Beginning March 29th 2017, PayPal will offer a few enhancements that may require integration changes. Read more here: Payments Standard Upgrade FAQ
I have seen some integrations experiencing this very same issue today, can you share the URL, button you are using to generate the error?
I will have a look
I am having this problem in my local development enviornment, But Some of our client told us the same problem is also occured in the live enviornmet for few countries only, but the problem is we dont know for which countries this issue occured.