Error messages

Vincent AARON <[email protected]>
Newsgroups gmane.network.cacti.user,gmane.network.net-snmp.user,gmane.network.dns.bind9.user
Message-ID <[email protected]>
hi all
I'm frustated. Since 4 days I try to configure cacti without any success.
I have now this Messages
Fatal error: Call to undefined function:  session_start() in 
/var/www/html/cacti/include/config.php on line 89


My cacti version is: cacti-0.8.6g-1

Do you know how to resolve it?
regards



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