Error: Not able to create requested visual.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x2ab1ac9b32b0 (LWP 20930)]
osg::GraphicsContext::realize (this=0x0)
    at /home/aj/flightgear/OSG/OpenSceneGraph/src/osg/GraphicsContext.cpp:413
413         if (realizeImplementation())
(gdb) bt
#0  osg::GraphicsContext::realize (this=0x0)
    at /home/aj/flightgear/OSG/OpenSceneGraph/src/osg/GraphicsContext.cpp:413
#1  0x000000000046f824 in fgOSOpenWindow (w=1280, h=1024, bpp=16, alpha=false,
    stencil=true, fullscreen=false) at fg_os_osgviewer.cxx:191
#2  0x000000000042301a in fgMainInit (argc=1, argv=0x7fff02784778) at main.cxx:1070
#3  0x000000000042241d in main (argc=1, argv=0x7fff02784778) at bootstrap.cxx:220