Get the message - another device is using the same address

I keep getting the message that another device is using the same ip address. I have to turn off my MacBook Pro from wifi and then back on again. Sometimes the wifi doesn't come back on for my MacBook Pro.
Running Mountain Lion. Thought all this hassle would be solved.

To follow up on what Thomas has said.
You have a device on your network that is using a fixed IP address in the range of addresses that your router assigns addresses from. You'll need to figure out what device that is and change its settings so that it gets a dynamic IP address assigned by the wireless router.
Or your MBP has a Fixed IP.
Or if you need certain devices to have Fixed IPs, like a printers which should always be assigned a fixed IP, then you need to assign those IPs out side the DHCP Pool range the router uses to hand out Dynamic IP but yet still in the total range of the routers IP address.

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