We apologize for the instability of composr.app and appreciate your patience. We are working on the statistics addon and trying to find an optimal way to store and render data. Unfortunately, we have yet to find a solution that can handle the traffic (and therefore, tens of millions of statistical records) of composr.app. We're working hard on one.
I chased down the missing function and then determined that the module that it resides within was never being loaded. Modified admin_setupwizard.php @ line 835 by adding 'require_code('news2');. ULed file to my server and then ran the SetupWizard with almost all options as Default. SetupWizard completed normally. I don't know if this is the correct place to modify. I will go back and pick my options requirements. Stay Tuned!
#2920 - RC21 manual extract crashed with Critical Error in Setup Wizzard