com.google.gwt.user.client.rpc.XsrfToken

We are encountering this message for quite sometime now after entering the login credentials in the application, although it didn't let us logged in into the application. Then after clearing the browser's cache the message no is no longer showing... but this has something that we're experiencing almost everyday. Wondering if there's a way to totally removed it and not us do the clearing of cache from the browser?