IllegalStateException: Function is not supported

[The_Terminator]

Hi,

I'm getting the following exceptions when trying to run my program in NetBeans, and I can't figure out what could be the cause:

Fri Jul 02 23:39:36 BST 2010 ERROR:Invalid operation (1282)
org.lwjgl.opengl.OpenGLException: Invalid operation (1282)
        at org.lwjgl.opengl.Util.checkGLError(Util.java:56)
        at org.lwjgl.opengl.GL11.glGetInteger(GL11.java:1441)
        at org.lwjgl.opengl.GLContext.getSupportedExtensions(GLContext.java:258)
        at org.lwjgl.opengl.ContextCapabilities.initAllStubs(ContextCapabilities.java:4355)
        at org.lwjgl.opengl.ContextCapabilities.<init>(ContextCapabilities.java:4661)
        at org.lwjgl.opengl.GLContext.useContext(GLContext.java:352)
        at org.lwjgl.opengl.Context.makeCurrent(Context.java:183)
        at org.lwjgl.opengl.Display.makeCurrent(Display.java:730)
        at org.lwjgl.opengl.Display.makeCurrentAndSetSwapInterval(Display.java:896)
        at org.lwjgl.opengl.Display.create(Display.java:860)
        at org.lwjgl.opengl.Display.create(Display.java:784)
        at org.newdawn.slick.AppGameContainer.tryCreateDisplay(AppGameContainer.java:299)
        at org.newdawn.slick.AppGameContainer.access$000(AppGameContainer.java:34)
        at org.newdawn.slick.AppGameContainer$2.run(AppGameContainer.java:364)
        at java.security.AccessController.doPrivileged(Native Method)
        at org.newdawn.slick.AppGameContainer.setup(AppGameContainer.java:345)
        at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:314)
        at proceduralgame.Main.main(Main.java:69)
Fri Jul 02 23:39:36 BST 2010 INFO:Starting display 1280x1024
Exception in thread "main" java.lang.IllegalStateException: Function is not supported
        at org.lwjgl.BufferChecks.checkFunctionAddress(BufferChecks.java:64)
        at org.lwjgl.opengl.GL11.glEnable(GL11.java:1047)
        at org.newdawn.slick.opengl.renderer.ImmediateModeOGLRenderer.initDisplay(ImmediateModeOGLRenderer.java:34)
        at org.newdawn.slick.GameContainer.initGL(GameContainer.java:723)
        at org.newdawn.slick.GameContainer.initSystem(GameContainer.java:748)
        at org.newdawn.slick.AppGameContainer.setup(AppGameContainer.java:378)
        at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:314)
        at proceduralgame.Main.main(Main.java:69)

I'm using Slick to create my game, and I've had it working in the past. Recently I reorganised my game's file structure, which involved moving the libraries around a bit, and ever since then, I haven't been able to get it to work (though all the paths etc are correct). I'm using NetBeans 6.8, on Windows 7 x64.

Looking through Slick's source code, the OpenGLException occurs when it calls Display.create. Does anyone have any suggestions for what might be causing it?

[kappa]

which graphics card are you using and which version of lwjgl do you have?

[The_Terminator]

I have an ATI HD4890, with the 9.12 drivers (I should really update at some point). That hasn't changed since before LWJGL was last working though.

I'm using LWJGL 2.4, and I also recompiled Slick with that version instead of the 2.3 it normally comes with.

[The_Terminator]

Found out what the problem was, and as always, it's embarrasingly simple: I was loading both lwjgl.jar and lwjgl-debug.jar at the same time. I thought the debug package was simply a set of extra debugging tools to use on top of the main library, turns out that was a flawed assumption. Everything seems to be working perfectly now anyway.