After I update the version 1.5.1, I use the piwik archiving, but I found the archiveing process couldn’t finish correctly. The following infomation is the the archiving
root@localhost cron]# sh archive.sh
Starting Piwik reports archiving…
Reports archiving finished.
Starting Scheduled tasks…Piwik › Error
Zend_Session is currently marked as read-only.
Is there some errors in my configuration or I forgot something? thanks