The guys who attended "Getting Started with Community Server" at last weekend's New England Code Camp have already seen this error on the big screen as we were having our first look at a new Community Server site we created with the Web Installer. D'oh! We were able to clear the error and display our sweet new site, but not immediately because I was being dumb. My excuse is that the laptop is my first of the modern era and I use only Windows Server in my office, so working with multiple Community Server sites in Windows XP Pro is still new to me.
When you see the UserRolesNames NullReference Exception error it means, in non-technical terms, that two Community Server sites are fighting over the same cookies. My laptop is named Nordic (after my [NordicTrack]) and my NORDIC/cs21demo site was trying to use NORDIC/dbvtcs21's cookies. Clear the cookies, restart the browser, and the error goes away. (Or, if giving a demo with IE7, load the site in Firefox, which is what we did at Code Camp.) And yes, multiple Community Server sites on XP Pro work just fine. We're only talking about the initial site cookie grab.
