Exception in thread "Render thread" java.lang.RuntimeException: com.jogamp.opengl.GLException: Caught NullPointerException: Cannot read field "gprefs" because "custom.multisession.MultiSession.activeSession" is null on thread AWT-EventQueue-0 at com.jogamp.common.util.awt.AWTEDTExecutor.invoke(AWTEDTExecutor.java:58) at jogamp.opengl.awt.AWTThreadingPlugin.invokeOnOpenGLThread(AWTThreadingPlugin.java:103) at jogamp.opengl.ThreadingImpl.invokeOnOpenGLThread(ThreadingImpl.java:201) at com.jogamp.opengl.Threading.invokeOnOpenGLThread(Threading.java:202) at com.jogamp.opengl.Threading.invoke(Threading.java:221) at com.jogamp.opengl.awt.GLCanvas.display(GLCanvas.java:503) at haven.JOGLPanel.uglyjoglhack(JOGLPanel.java:212) at haven.JOGLPanel.renderloop(JOGLPanel.java:223) at java.base/java.lang.Thread.run(Thread.java:840) Caused by: com.jogamp.opengl.GLException: Caught NullPointerException: Cannot read field "gprefs" because "custom.multisession.MultiSession.activeSession" is null on thread AWT-EventQueue-0 at com.jogamp.opengl.GLException.newGLException(GLException.java:76) at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:1327) at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:1147) at com.jogamp.opengl.awt.GLCanvas$12.run(GLCanvas.java:1442) at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:308) at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:720) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:714) at java.base/java.security.AccessController.doPrivileged(AccessController.java:399) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86) at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742) at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203) at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113) at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109) at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90) Caused by: java.lang.NullPointerException: Cannot read field "gprefs" because "custom.multisession.MultiSession.activeSession" is null at haven.JOGLPanel.iswap(JOGLPanel.java:124) at haven.JOGLPanel.initgl(JOGLPanel.java:130) at haven.JOGLPanel.redraw(JOGLPanel.java:161) at haven.JOGLPanel$1.display(JOGLPanel.java:95) at jogamp.opengl.GLDrawableHelper.displayImpl(GLDrawableHelper.java:692) at jogamp.opengl.GLDrawableHelper.display(GLDrawableHelper.java:674) at com.jogamp.opengl.awt.GLCanvas$11.run(GLCanvas.java:1428) at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:1293) ... 15 more