Please help me ASAP

[Its Me]

Hi,
I am new user in Linux,I have install freeradius2 rpm in my Linux machine(RHEL-5.5 Server),I m facing problem below detail ,please help me how can i install and setup my radiusd -X output below problem.

radiusd: #### Opening IP addresses and Ports ####
listen {
        type = "auth"
        ipaddr = *
        port = 0
Failed binding to authentication address * port 1812: Address already in use
/etc/raddb/radiusd.conf[240]: Error binding to port for 0.0.0.0 port 1812
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