Notice: Undefined index: enable_processing_unique_visitors_day in /www/nepda/piwik-nepda/core/Piwik.php on line 53

Notice: Undefined index: enable_processing_unique_visitors_day in /www/nepda/piwik-nepda/core/Piwik.php on line 53

Backtrace -->
#0 Piwik_ErrorHandler(…) called at [/www/nepda/piwik-nepda/core/Piwik.php:53]#1 Piwik::isUniqueVisitorsEnabled(…) called at [/www/nepda/piwik-nepda/core/Controller.php:517]#2 Piwik_Controller::setPeriodVariablesView(…) called at [/www/nepda/piwik-nepda/core/Controller.php:428]#3 Piwik_Controller->setGeneralVariablesView(…) called at [/www/nepda/piwik-nepda/plugins/MultiSites/Controller.php:157]#4 Piwik_MultiSites_Controller->getSitesInfo(…) called at [/www/nepda/piwik-nepda/plugins/MultiSites/Controller.php:36]#5 Piwik_MultiSites_Controller->index(…) called at [:]#6 call_user_func_array(…) called at [/www/nepda/piwik-nepda/core/FrontController.php:138]#7 Piwik_FrontController->dispatch(…) called at [/www/nepda/piwik-nepda/index.php:53]

Thanks for th ereport please try http://dev.piwik.org/trac/changeset/6443

thanks. i solved this for me already (nearly same solution as you submitted) i just wanted to commit this to the community.