[octomap_server-1] process has died

Hi All, I get this error whenever i use launch the octomap_server , I havent had much success finding out where the error is , terminate called after throwing an instance of 'boost::exception_detail::clone_impl>' what(): boost: mutex lock failed in pthread_mutex_lock: Invalid argument [octomap_server-1] process has died [pid 2851, exit code -6, cmd /opt/ros/indigo/lib/octomap_server/octomap_server_node __name:=octomap_server My launch file In the Gazebo Sim also rosservice call gazebo/unpause_physics Kindly help me out here, Thanks, Jay