Access-Control-Allow-Origin

After changing the sub subdomain in my account, this error shows in the console and i can´t send any document:

XMLHttpRequest cannot load https://secure.na1.echosign.com/api/rest/v5/users/me/settings. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'https://corebooks.na1.echosign.com' is therefore not allowed access.