Untitled

java.lang.NullPointerException: mode must be non-null
        at org.lwjgl.opengl.Display.setDisplayMode(Display.java:243)
        at core.HexRLEngine.createWindow(HexRLEngine.java:182)
        at core.HexRLEngine.init(HexRLEngine.java:203)
        at core.HexRLEngine.init(HexRLEngine.java:189)
        at game.HexRL.init(HexRL.java:177)
        at game.HexRL.main(HexRL.java:238)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.sun.javaws.Launcher.executeApplication(Launcher.java:1748)
        at com.sun.javaws.Launcher.executeMainClass(Launcher.java:1694)
        at com.sun.javaws.Launcher.doLaunchApp(Launcher.java:1480)
        at com.sun.javaws.Launcher.run(Launcher.java:130)
        at java.lang.Thread.run(Thread.java:619)