[LibGDX] Can't find files

I am newbie at LibGDX and i wanted to try that simple game. https://github.com/libgdx/libgdx/wiki/A-simple-game

But when i want to run it it shows error that JVM can’t find files.http://pastebin.java-gaming.org/8236d538e89

Yeah.I have trying to fix it but nothing is changing.

Waiting for some help :-\

  1. Where did you put that file?
  2. Which path to the file do you give the program?

I did put files in assets/data

and the path of files what i gave

 dropImage = new Texture(Gdx.files.internal("data/droplet.png"));
	      bucketImage = new Texture(Gdx.files.internal("data/bucket.png"));
	      dropSound = Gdx.audio.newSound(Gdx.files.internal("data/drop.wav"));
	      rainMusic = Gdx.audio.newMusic(Gdx.files.internal("data/rain.mp3"));

I did fix it ;D