Merchant Security Updates: Learn how security upgrades may affect your integration at the 2017-2018 Merchant Security Roadmap Microsite
Upcoming Change to PayPal Subscriptions Beginning February 1, 2018, changes will be made to the way PayPal creates, manages, and displays subscriptions. Click here for an FAQ related to the upcoming changes being made to PayPal subscriptions.
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.