There is an error. Please report the message (Piwik 1.10.1) and full backtrace in the Piwik forums (please do a Search first as it might have been reported already!).
Notice: Undefined index: sitesearch in /var/www/web2/html/piwik/core/Site.php on line 265
Backtrace -->
#0 Piwik_ErrorHandler(…) called at [/var/www/web2/html/piwik/core/Site.php:265]
#1 Piwik_Site::getFor(…) called at [/var/www/web2/html/piwik/core/Site.php:331]
#2 Piwik_Site::isSiteSearchEnabledFor(…) called at [/var/www/web2/html/piwik/plugins/Actions/Actions.php:558]
#3 Piwik_Actions->isSiteSearchEnabled(…) called at [/var/www/web2/html/piwik/plugins/Actions/Actions.php:546]
#4 Piwik_Actions->addMenus(…) called at [:]
#5 call_user_func_array(…) called at [/var/www/web2/html/piwik/libs/Event/Dispatcher.php:284]
#6 Event_Dispatcher->postNotification(…) called at [/var/www/web2/html/piwik/core/PluginsManager.php:723]
#7 Piwik_PostEvent(…) called at [/var/www/web2/html/piwik/core/Menu/Main.php:65]
#8 Piwik_Menu_Main->get(…) called at [/var/www/web2/html/piwik/core/Menu/Main.php:90]
#9 Piwik_GetMenu(…) called at [/var/www/web2/html/piwik/plugins/CoreHome/Controller.php:61]
#10 Piwik_CoreHome_Controller->getDefaultIndexView(…) called at [/var/www/web2/html/piwik/plugins/CoreHome/Controller.php:95]
#11 Piwik_CoreHome_Controller->index(…) called at [:]
#12 call_user_func_array(…) called at [/var/www/web2/html/piwik/core/FrontController.php:138]
#13 Piwik_FrontController->dispatch(…) called at [/var/www/web2/html/piwik/index.php:53]
This is the Error Message, Can you help me please ;o))