'Unable to properly run LibGDX program

Im trying to use LibGDX and Box2d to create a game, but whenever I run it, it closes and this error appears.

Exception in thread "main" com.badlogic.gdx.utils.GdxRuntimeException: java.lang.ExceptionInInitializerError
    at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application.<init>(Lwjgl3Application.java:122)
    at inf112.skeleton.app.Main.main(Main.java:12)
Caused by: java.lang.ExceptionInInitializerError
    at inf112.skeleton.app.screens.GameScreen.<init>(GameScreen.java:42)
    at inf112.skeleton.app.screens.MainMenu.render(MainMenu.java:79)
    at com.badlogic.gdx.Game.render(Game.java:46)
    at inf112.skeleton.app.AGame.render(AGame.java:32)
    at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Window.update(Lwjgl3Window.java:403)
    at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application.loop(Lwjgl3Application.java:143)
    at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application.<init>(Lwjgl3Application.java:116)
    ... 1 more

libgdx box2d

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'Unable to properly run LibGDX program

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