I've created a couple of AVD-s in Android Studio. They were launching on emulator port 5554. Then I've created another AVD via
adb devices -l
List of devices attached
error: more than one device/emulator
When i am facing same issues then doing like below: 1) Restart adb by issuing 'adb kill-server' followed by 'adb start-server' at a cmd prompt 2) Disable and re-enable USB debugging on the phone 3) Rebooting the phone if it still doesn't work. 99% of my issues have been resolved with these steps.