I don’t know if you know this but 4.4 has some issues.
In order for it to work you will have to change your project’s target SDK to 4.4 KitKat or if you haven’t installed the version yet go into android manager and get the appropriate files.
Even then your app may not work, if it doesn’t, downgrade your device to android 4.3 or whatever version your app was working at.
Hope this helps!