Multiple addons?

I’m trying to enable an add on I downloaded.
“NeuroMorph_Measurement_Tools”
But I’m getting an error message:
"Multiple add ons using the same name found!
likely a problem with the script path.
(see consoles for details)

Anybody know how to fix this?
I’m on a MAc.
Should I reload Blender?

There is an addon with the same name in one of the possible addon directories, which are scripts path in user preferences -> file and these http://www.blender.org/manual/getting_started/installing_blender/directorylayout.html