Strange Message when I try to upload

I’m new to arduino/uno.

Im trying to upload a sketch on my uno. I was using a YUN and removed it. I am now only connected to my Mac by USB. I get the message below...

avrdude: ser_open(): can't open device "10.0.2.8": No such file or directory
ioctl("TIOCMGET"): Inappropriate ioctl for device
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

What would cause the uno to think it has an IP address?
How do I correct this?

Thanks
How

Did you select the correct port after you connected the Uno?