Merchant Security Updates: Learn how security upgrades may affect your integration at the 2017-2018 Merchant Security Roadmap Microsite
PayPal-Apps.com will be permanently unavailable starting December 1, 2017. PayPal-Apps.com will be permanently unavailable starting December 1, 2017. We will review all Adaptive products applications submitted prior to December 1, 2017 according to the existing approval process.If an application has been submitted and you need to check the status, please contact your Account Manager. If you are unsure who your Account Manager is, please Contact Us. We are working on an improved solution for our Adaptive Payments customers in 2018. Check the MTS community page for updates and questions, here All other applications can be created on Developer.PayPal.com.
What is the error that you're getting? Is this happening with API calls or browsing the regular sandbox website? Have you tried clearing the browser cache / cookies?
For future reference, it's a lot easier for people to help you in forums if you provide details about the problem you're having. "I got an error" really doesn't give us much to work with.
and this error
[Error] Failed to load resource: отменено (logger, line 0) [Error] XMLHttpRequest cannot load https://www.paypal.com/webapps/hermes/api/logger due to access control checks.