Server :: Error When Restarting Network Service

I use red hat linux. When I start up network service. I get below error in eth2
root@vls etc]# service network restart
Shutting down interface eth2: [OK]
Shutting down loopback interface: [OK]
Bringing up loopback interface: [OK]
Bringing up interface eth2: RTNETLINK answers: File exists
Error adding address 10.1.1.82 for eth2. [OK]

I paste the ifcfg-eth2 in here
[root@vls network-scripts]# cat ifcfg-eth2
# Intel Corporation 82572EI Gigabit Ethernet Controller (Copper)
DEVICE=eth2
BOOTPROTO=none
BROADCAST=10.1.255.255
HWADDR=00:80:82:8F:B4:A2
IPADDR=10.1.1.82
NETMASK=255.255.0.0
NETWORK=10.1.0.0
ONBOOT=yes
GATEWAY=10.1.1.249
TYPE=Ethernet
USERCTL=yes
IPV6INIT=no
PEERDNS=yes
So, what is the problem of error adding address?