The magic method __toString() must have public visibility and cannot be static 
in '/datos/www/stats.colbenson.es/core/TablePartitioning.php' at the line 89

#0  Piwik_ErrorHandler(2, The magic method __toString() must have public visibility and cannot be static, /datos/www/stats.colbenson.es/core/TablePartitioning.php, 89, Array ([GLOBALS] => Array ( *RECURSION*,[_POST] => Array (),[_GET] => Array (),[_COOKIE] => Array (),[_FILES] => Array (),[piwik_minimumPHPVersion] => 5.1.3,[piwik_currentPHPVersion] => 5.3.3,[piwik_zend_compatibility_mode] => ,[_REQUEST] => Array (),[_SERVER] => Array ([DOCUMENT_ROOT] => /datos/www/stats.colbenson.es,[HTTP_ACCEPT] => text/html,application/xhtml+xml,text/xml;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5,[HTTP_ACCEPT_CHARSET] => ISO-8859-1,utf-8;q=0.7,*;q=0.7,[HTTP_ACCEPT_ENCODING] => gzip,[HTTP_ACCEPT_LANGUAGE] => en-us,en;q=0.5,[HTTP_CACHE_CONTROL] => no-cache,[HTTP_CONNECTION] => close,[HTTP_HOST] => stats.colbenson.es,[HTTP_PRAGMA] => no-cache,[HTTP_USER_AGENT] => CCBot/1.0 (+http://www.commoncrawl.org/bot.html),[HTTP_X_CC_ID] => ccc01-02,[PATH] => /bin:/usr/bin:/sbin:/usr/sbin:/opt/php/bin,[REDIRECT_SCRIPT_URI] => http://stats.colbenson.es/,[REDIRECT_SCRIPT_URL] => /,[REDIRECT_STATUS] => 200,[REDIRECT_URL] => /,[REMOTE_ADDR] => 38.107.179.212,[REMOTE_PORT] => 59289,[SCRIPT_FILENAME] => /datos/www/stats.colbenson.es/index.php,[SCRIPT_URI] => http://stats.colbenson.es/,[SCRIPT_URL] => /,[SERVER_ADDR] => 82.98.162.30,[SERVER_ADMIN] => webmaster@colbenson.es,[SERVER_NAME] => stats.colbenson.es,[SERVER_PORT] => 80,[SERVER_SIGNATURE] => ,[SERVER_SOFTWARE] => Apache,[GATEWAY_INTERFACE] => CGI/1.1,[SERVER_PROTOCOL] => HTTP/1.1,[REQUEST_METHOD] => GET,[QUERY_STRING] => ,[REQUEST_URI] => /,[SCRIPT_NAME] => /index.php,[PATH_TRANSLATED] => /datos/www/stats.colbenson.es/index.php,[PHP_SELF] => /index.php,[REQUEST_TIME] => 1327686215),[_Event_Dispatcher] => Array ([NotificationClass] => Event_Notification),[_SESSION] => Array ())) called at [/datos/www/stats.colbenson.es/core/ArchiveProcessing.php:12]
#1  require_once() called at [/datos/www/stats.colbenson.es/core/ArchiveProcessing.php:12]
#2  require_once(/datos/www/stats.colbenson.es/core/ArchiveProcessing.php) called at [/datos/www/stats.colbenson.es/core/Archive.php:14]
#3  require_once(/datos/www/stats.colbenson.es/core/Archive.php) called at [/datos/www/stats.colbenson.es/core/FrontController.php:29]
#4  require_once(/datos/www/stats.colbenson.es/core/FrontController.php) called at [/datos/www/stats.colbenson.es/index.php:46]