Box2D with LibGDX

Newbie & Debugging Questions
#1

I’ve been having problems when setting up Box2D. I tried several LibGDX builds but no success.
When googling the only answer I found was

GdxNativesLoader.load();
		world = new World(new Vector2(0, -0.981f), true);

instead of

World world = new World(new Vector2(0, -0.981f), true);

Error :

Exception in thread "LWJGL Application" com.badlogic.gdx.utils.GdxRuntimeException: java.lang.UnsatisfiedLinkError: org.jbox2d.common.Timer.now()D
	at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:120)
Caused by: java.lang.UnsatisfiedLinkError: org.jbox2d.common.Timer.now()D
	at org.jbox2d.common.Timer.now(Native Method)
	at org.jbox2d.common.Timer.reset(Timer.java:35)
	at org.jbox2d.common.Timer.<init>(Timer.java:31)
	at org.jbox2d.dynamics.World.<init>(World.java:587)
	at org.jbox2d.dynamics.World.<init>(World.java:158)
	at org.jbox2d.dynamics.World.<init>(World.java:154)
	at org.jbox2d.dynamics.World.<init>(World.java:145)
	at com.badlogic.gdx.physics.box2d.World.<init>(World.java:61)
	at com.rac2d.screen.GameScreen.show(GameScreen.java:30)----->points to world = new World()

Which I am both doing

#2

It seems to work when I change to gdx 0.9.8 strange.
It has nothing to do with code.

#3

Did you try 0 - .981f instead of -.981f ?