Inconsistent address and mask

 Dear All,

I am facing the following error. My routers output is as follow.
Why I am facing this error.

Cisco-R1#sh ip int brief
Interface
   IP-Address OK? Method Status Protocol
FastEthernet0/0
         12.12.12.1 YES manual up up
FastEthernet0/1 unassigned YES unset administratively down
down
Loopback0 1.1.1.1 YES manual up
       up
Cisco-R1#

Cisco-R1#sh runn int fa0/0
Building
configuration...

Current configuration : 91 bytes
!
interface FastEthernet0/0
 ip address 12.12.12.1 255.0.0.0
 duplex auto
 speed auto
end

Cisco-R1#
Cisco-R1(config)#ip route 23.23.23.0 255.255.0.0 12.12.12.2
%Inconsistent
address and mask
Cisco-R1(config)#

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Received on Sat Jun 22 2013 - 04:38:49 ART