Gazebo simulator error [closed]

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Error [RenderEngine.cc:641] Unable to create glx visual Warning [RenderEngine.cc:92] Unable to create X window. Rendering will be disabled Segmentation fault (core dumped) [gazebo_gui-3] process has died [pid 2641, exit code 139, cmd /opt/ros/hydro/lib/gazebo_ros/gzclient __name:=gazebo_gui __log:=/home/ankur/.ros/log/b5bf6eea-8147-11e4-8fd0-0008caf4212c/gazebo_gui-3.log]. log file: /home/ankur/.ros/log/b5bf6eea-8147-11e4-8fd0-0008caf4212c/gazebo_gui-3*.log

System configuration- ubuntu 12.04 lts 64bit processor - core i7 2.2ghz graphics- Nvidia 630M 2gb and intel HD graphics on board Ram- 8gb "Installed nvidia 346.22 latest driver" "X11 xorg is installed" "lightdm is working fine" "system updated and no package error"