Android studio - connect to device - Sony E2003
It seems your computer is not recognizing your device or not able to download the device driver of your mobile phone Sony E2003 

Possible solution is to download and install moborobo from this website in your computer 

http://www.moborobo.com/

It will install the required device driver to connect your phone with the computer and then your device can be easily detectable in Android Studio

Hope this will help!!!