I just tried to update my Piwik installation and I got this message:
There is an error. Please report the message and full backtrace in the Piwik forums.
Notice: Undefined property: Piwik_CoreUpdater_Controller::$pathRootExtractedPiwik in /home1/ishkario/public_html/piwik/plugins/CoreUpdater/Controller.php on line 99
Backtrace -->
#0 Piwik_ErrorHandler(8, Undefined property: Piwik_CoreUpdater_Controller::$pathRootExtractedPiwik, /home1/ishkario/public_html/piwik/plugins/CoreUpdater/Controller.php, 99, Array ()) called at [/home1/ishkario/public_html/piwik/plugins/CoreUpdater/Controller.php:99]#1 Piwik_CoreUpdater_Controller->oneClick_Unpack() called at [/home1/ishkario/public_html/piwik/plugins/CoreUpdater/Controller.php:63]#2 Piwik_CoreUpdater_Controller->oneClickUpdate() called at [(null):0]#3 call_user_func_array(Array ([0] => Piwik_CoreUpdater_Controller Object ([] => ,[] => Array (),[] => Array (),[] => Array (),[] => CoreUpdater,[] => ,[] => ,[] => 0,[] => Piwik_Site Object ([] => 0),[newVersion] => 1.2.1,[pathPiwikZip] => /home1/ishkario/public_html/piwik/tmp/latest/latest.zip),[1] => oneClickUpdate), Array ()) called at [/home1/ishkario/public_html/piwik/core/FrontController.php:125]#4 Piwik_FrontController->dispatch() called at [/home1/ishkario/public_html/piwik/index.php:57]
So here I post it.