Crash on game over - restart

[matvidako]

Exception in thread "LWJGL Application" com.badlogic.gdx.utils.GdxRuntimeException: Asset not loaded: projectile_shoot.wav
at com.badlogic.gdx.assets.AssetManager.get(AssetManager.java:144)
at com.pixelfarmers.goat.SoundPlayer.getSound(SoundPlayer.java:57)
at com.pixelfarmers.goat.SoundPlayer.play(SoundPlayer.java:53)
at com.pixelfarmers.goat.SoundPlayer.handleMessage(SoundPlayer.java:39)
at com.badlogic.gdx.ai.msg.MessageDispatcher.discharge(MessageDispatcher.java:583)
at com.badlogic.gdx.ai.msg.MessageDispatcher.dispatchMessage(MessageDispatcher.java:490)
at com.badlogic.gdx.ai.msg.MessageDispatcher.dispatchMessage(MessageDispatcher.java:201)
at com.pixelfarmers.goat.screen.GameScreen$1.touchDown(GameScreen.java:315)
at com.badlogic.gdx.backends.lwjgl.LwjglInput.processEvents(LwjglInput.java:329)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:215)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:124)