The magic method __toString() must have public visibility and cannot be static 
in '/var/www/stats.screenwork-net.de/httpdocs/modules/TablePartitioning.php' at the line 84

#0  Piwik_ErrorHandler(2, The magic method __toString() must have public visibility and cannot be static, /var/www/stats.screenwork-net.de/httpdocs/modules/TablePartitioning.php, 84, Array ([GLOBALS] => Array ( *RECURSION*,[_POST] => Array (),[_GET] => Array (),[_COOKIE] => Array (),[_FILES] => Array (),[piwik_minimumPhpVersion] => 5.1.3,[piwik_currentVersion] => 5.3.10,[piwik_zend_compatibility_mode] => ,[_REQUEST] => Array (),[_SERVER] => Array ([PHPRC] => /var/www/stats.screenwork-net.de/conf/,[PATH] => /sbin:/bin:/usr/sbin:/usr/bin,[PWD] => /var/www/stats.screenwork-net.de/cgi-bin,[SHLVL] => 0,[FCGI_ROLE] => RESPONDER,[REDIRECT_HANDLER] => application/x-httpd-php,[REDIRECT_STATUS] => 200,[HTTP_X_CC_ID] => ccc02-01,[HTTP_HOST] => stats.screenwork-net.de,[HTTP_USER_AGENT] => CCBot/1.0 (+http://www.commoncrawl.org/bot.html),[HTTP_ACCEPT] => text/html,application/xhtml+xml,text/xml;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5,[HTTP_ACCEPT_LANGUAGE] => en-us,en;q=0.5,[HTTP_ACCEPT_ENCODING] => gzip,[HTTP_ACCEPT_CHARSET] => ISO-8859-1,utf-8;q=0.7,*;q=0.7,[HTTP_CONNECTION] => close,[HTTP_CACHE_CONTROL] => no-cache,[HTTP_PRAGMA] => no-cache,[SERVER_SIGNATURE] => ,[SERVER_SOFTWARE] => Apache,[SERVER_NAME] => stats.screenwork-net.de,[SERVER_ADDR] => 83.169.50.253,[SERVER_PORT] => 80,[REMOTE_ADDR] => 38.107.179.219,[DOCUMENT_ROOT] => /var/www/stats.screenwork-net.de/httpdocs,[SERVER_ADMIN] => root@scrw-net.de,[SCRIPT_FILENAME] => /var/www/stats.screenwork-net.de/httpdocs/index.php,[REMOTE_PORT] => 58365,[REDIRECT_URL] => /index.php,[GATEWAY_INTERFACE] => CGI/1.1,[SERVER_PROTOCOL] => HTTP/1.1,[REQUEST_METHOD] => GET,[QUERY_STRING] => ,[REQUEST_URI] => /,[SCRIPT_NAME] => /index.php,[ORIG_SCRIPT_FILENAME] => /var/www/stats.screenwork-net.de/cgi-bin/php,[ORIG_PATH_INFO] => /index.php,[ORIG_PATH_TRANSLATED] => /var/www/stats.screenwork-net.de/httpdocs/index.php,[ORIG_SCRIPT_NAME] => /cgi-bin/php,[PHP_SELF] => /index.php,[REQUEST_TIME] => 1337537186),[_Event_Dispatcher] => Array ([NotificationClass] => Event_Notification),[_SESSION] => Array ())) called at [/var/www/stats.screenwork-net.de/httpdocs/modules/ArchiveProcessing.php:12]
#1  require_once() called at [/var/www/stats.screenwork-net.de/httpdocs/modules/ArchiveProcessing.php:12]
#2  require_once(/var/www/stats.screenwork-net.de/httpdocs/modules/ArchiveProcessing.php) called at [/var/www/stats.screenwork-net.de/httpdocs/modules/Archive.php:15]
#3  require_once(/var/www/stats.screenwork-net.de/httpdocs/modules/Archive.php) called at [/var/www/stats.screenwork-net.de/httpdocs/modules/API/APIable.php:13]
#4  require_once(/var/www/stats.screenwork-net.de/httpdocs/modules/API/APIable.php) called at [/var/www/stats.screenwork-net.de/httpdocs/modules/FrontController.php:26]
#5  require_once(/var/www/stats.screenwork-net.de/httpdocs/modules/FrontController.php) called at [/var/www/stats.screenwork-net.de/httpdocs/index.php:46]