What other computer do you have connected to the same network? That is wireless AND wired computers, network printers, etc. As it has been pointed out by kingjr3 another machine is using the same IP.
Firstly, you should have used the crosshairs when taking your screenshot and selected the error message box, and not your whole screen, it's pretty hard to see! The shortcut to do that is Command-Shift-4.
Ok... now, your best bet to fix this issue, is to assign a specific IP to your computer. You can do this by going into your System preferences > network.
Ok... now, your best bet to fix this issue, is to assign a specific IP to your computer. You can do this by going into your System preferences > network.
I have this same problem! I'm on a network I control, using DHCP to assign addresses. When I assign a static IP to a device I make darn well sure that it is outside the range of dynamic IPs the router uses... but these messages will not go away. 😕
If the router is accessible I would check which IP are assigned to which devices and then correct the problem (by either using DHCP everywhere or setting the IP outside the DHCP IP range). How you do it depends on which routers one have.
IF everything seems to be correct try restarting the router.
I have this same problem! I'm on a network I control, using DHCP to assign addresses. When I assign a static IP to a device I make darn well sure that it is outside the range of dynamic IPs the router uses... but these messages will not go away. 😕