could not load modules on centos directory does not exist?

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http://serverfault.com – im trying to allow ftp access on my server I am running Centos 5.x i have instantiated the correct rules in my iptables but when trying to load "ip_conntrack_ftp i get this error: FATAL: Could not load /lib/modules/2.6.18-028stab091.2/modules.dep: No such file or directory also I have check my modules directory and it contains nothing. thank you. (HowTos)