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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.
I keep getting this message--
It works on Firefox, which I never use, but not on Safari, which I always use???