Hello there, I have encountered troubles when launching controllers, especially jointtrajectorycontroller. I got the following log from the terminal:

[INFO] [WallTime: 1480474127.896390] [5.150000] Controller Spawner: Loaded controllers: left_leg_controller, right_leg_controller, head_controller, left_arm_controller, right_arm_controller

Traceback (most recent call last):

  File "/opt/ros/indigo/lib/controller_manager/spawner", line 212, in <module>
    if __name__ == '__main__': main()
  File "/opt/ros/indigo/lib/controller_manager/spawner", line 204, in main
    resp = switch_controller(loaded, [], 2)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/rospy/impl/tcpros_service.py", line 435, in __call__
    return self.call(*args, **kwds)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/rospy/impl/tcpros_service.py", line 525, in call
    raise ServiceException("transport error completing service call: %s"%(str(e)))

**rospy.service.ServiceException: transport error completing service call: unable to receive data from sender, check sender's logs for details**

[INFO] [WallTime: 1480474129.103476] [5.157000] Shutting down spawner. Stopping and unloading controllers...
Segmentation fault (core dumped)

[gazebo-1] process has died [pid 21849, exit code 139, cmd /home/viki/catkin_ws/src/gazebo_ros_pkgs/gazebo_ros/scripts/gzserver -e ode /home/viki/catkin_ws/src/reemc_robot/reemc_simulation/reemc_gazebo/worlds/empty.world __name:=gazebo __log:=/home/viki/.ros/log/aba3bd78-b6a4-11e6-9191-080027b46cdd/gazebo-1.log].
log file: /home/viki/.ros/log/aba3bd78-b6a4-11e6-9191-080027b46cdd/gazebo-1*.log

**[WARN] [WallTime: 1480474160.106558] [5.157000] Controller Spawner couldn't reach controller_manager to take down controllers. Waited for 30 second(s).**

[joint_trajectory_controllers_spawner-3] process has died [pid 21862, exit code 1, cmd /opt/ros/indigo/lib/controller_manager/spawner left_leg_controller right_leg_controller head_controller left_arm_controller right_arm_controller __name:=joint_trajectory_controllers_spawner __log:=/home/viki/.ros/log/aba3bd78-b6a4-11e6-9191-080027b46cdd/joint_trajectory_controllers_spawner-3.log].
log file: /home/viki/.ros/log/aba3bd78-b6a4-11e6-9191-080027b46cdd/joint_trajectory_controllers_spawner-3*.log

^C[head_controller/point_head_action-4] killing on exit
[gazebo_gui-2] killing on exit
shutting down processing monitor...
... shutting down processing monitor complete

Can anyone figure what might be the problem of this issue? I am using Gazebo7 and ROS Indigo. Thank you very much!