Libdnet error message

Hello, I have just installed tcpreplay on our server (centos 5) and when I try to replay a pcap or cap file (Wireshark) I receive the following error message.

tcpreplay: error while loading shared libraries: libdnet.1: cannot open shared object file: No such file or directory

When I check to see if libdnet is installed, here is what I get:

rpm -qa | grep libdnet
libdnet-1.11-1.2.el5.rf

I have no idea how to correct this, or what the problem is after searching online for help.

Thanks in advance