'Device sharing same IP address as your computer' - what does this mean?

I purchased an Airport Express yesterday and was having connection problems after setting it up to only join my existing network (to play wireless audio to speakers in the kitchen) - I seem to have solved the issue by switching off WPS on my base station (provided by my ISP)
My question is: after making this change to the settings, I got a message saying 'this device' (presumably meaning the Airport Express) was now sharing the same IP address as my MacBook Pro.
What does this mean, and will there be any detrimental effects?

Thanks BTF. Presumably only my MacBook Pro and the Apple TV are connected to the internet as the Airport Express is only set up to join the existing network with the crappy router as the base station. Neither the ATV or AE have static IPs assigned.
I have since restarted my MacBook Pro and at present have Airplay audio streaming to the AE and video to the ATV simultaneously without any (at the moment) problems.

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