(java:4807): Gtk-WARNING **: Unable to locate theme engine in module_path: "mist",

(java:4807): Gtk-WARNING **: Unable to locate theme engine in module_path: "mist",
org.lwjgl.LWJGLException: X Error - disp: 0x7f41a808be60 serial: 1393 error: BadDrawable (invalid Pixmap or Window parameter) request_code: 155 minor_code: 7
    at org.lwjgl.opengl.LinuxDisplay.globalErrorHandler(LinuxDisplay.java:321)
    at org.lwjgl.opengl.GL11.nglClear(Native Method)
    at org.lwjgl.opengl.GL11.glClear(GL11.java:588)
    at com.badlogic.gdx.backends.lwjgl.LwjglGL20.glClear(LwjglGL20.java:125)
    at com.badlogic.gdx.tools.particleeditor.ParticleEditor$Renderer.render(ParticleEditor.java:371)
    at com.badlogic.gdx.backends.lwjgl.LwjglCanvas$3.run(LwjglCanvas.java:237)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:694)
    at java.awt.EventQueue$3.run(EventQueue.java:692)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
AL lib: (EE) alc_cleanup: 1 device not closed
raghuram@hisTerminal:~/libgdx$ cd libgdx/