Problems Running Android (beginner!)

I'm just currently following the tutorial for creaing android apps (http://developer.android.com/training/basics/firstapp/building-ui.html). I think ive followed all instructions,

Solution 1:

Are you using Eclipse?.

Were you ever able to run the program before?

If you could then restart your emulator/computer(try restarting your emulator first). I used to get this error once in a blue moon and only restarting the computer used to solve it.

I still haven't figured out why it happens.

Solution 2:

In my case it worked by restarting the Eclipse and relaunching the Emulator !

Try it out once.

Solution 3:

Change the Project's properties: Properties/Android/Project Build Target to Android 4.4.2 API 19 and the app should work.