Increasingly platforms are using browser cookies to provide a more seamless experience. Usually our browsers retain these cookies for the next time you visit a site. However, sometimes cookies can expire and then will give an error message similar to the ones here.
Usually clearing cookies and the browser cache will resolve the issue. Here are links to instructions for the main browsers that explain how to do this: Chrome, Firefox, Safari (see "Remove stored cookies and data"), Microsoft Edge.
Alternatively, you can browse in 'private' or 'incognito' mode. Here are instructions for how to use this option: Chrome, Firefox, Safari, Microsoft Edge.
