I just upgraded to 2.3.0 using the in app upgrade. Immediately after I see the following error when trying to access any page:
A fatal error occurred The following error just broke Piwik (v2.3.0): Call to undefined method Piwik\Settings\UserSetting::isReadableByCurrentUser() in /srv/www/piwik/ana/plugins/LeftMenu/API.php line 28 If this error continues to happen, there is a good chance to fix this issue by disabling one or more of the Third-Party plugins. You can enable them again in the Plugins or Themes page under settings at any time. If this error still occurs after disabling all plugins, you might want to consider uninstalling some plugins. Keep in mind: The plugin will be completely removed from your platform. ExampleFeedburner uninstall We appreciate if you send the error report to the Piwik team.