run Gazebo in ROS indigo in Virtualbox with libGl and openGl errors [closed]

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Error [gazebo.cc:220] Waited 11 seconds for namespaces. Giving up;  
libGL error: pci id for fd 10: 80ee:beef, driver (null);  
OpenGL Warning: Failed to connect to host. Make sure 3D acceleration is enabled for this VM;  
libGL error: core dri or dri2 extension not found;  
libGL error: failed to load driver: vboxvideo;  
Error [Node.cc:90] No namespace found;

Like I said, first run Gazebo, I see some error like that. any problem?
I just follow steps in http://gazebosim.org/tutorials?tut=ro... which is "Test that stand-alone Gazebo works"