ERROR: the user data image is used by another emulator. aborting

Got this error message after I restarted my system following an install prompt for another program (did not shut down the emulator first): "ERROR: the user data image is used by another emulator. aborting."  I fixed it, but had to try a couple different things.  Suggestions:

1. If the Emulator is open, restart it
2. If the Emulator is not opened (my case) try Run configurations > Target > Wipe user data > Run
3. Another way to try "Wipe user data" is to click the Android SDK Manager icon in Eclipse, click the AVD you want to start, make sure you check wipe user data, then Launch.

Number 3 worked for me.