This is the most common error message that people will see when using the site. It is extremely annoying and will sometimes trap you in a cycle of trying to login and being told that you need to login!

Generally, this occurs when the session or page has timed out - say you've had the site open for a while or have opened another window while logged in and the site gets confused as to whether you're logged in or not. It may also happen if you try to access pages or resources that are restricted to members only. Very occasionally, it is a sign that we're doing a bit of behind the scenes work!

The best solution is just to click on the home link which will generate a new session and then login. Hopefully, a software upgrade which I plan to do in the next couple of months will reduce the frequency of this error.