issue with Indigo

[Jaypancool]

Hello!
I have a issue. My Ros is Indigo, when exact "roslaunch trajectory_tracking turtlebot_world.launch", the teminal will show :
Warning [parser.cc:340] Converting a deprecated source[/home/jaypan/Documents/turtlebot_ws/src/trajectory_tracking/worlds/squared_room.world].
Warning [Converter.cc:59] Version[1.6] to Version[1.4]
Please use the gzsdf tool to update your SDF files.
$ gzsdf convert [sdf_file]
Error [Converter.cc:127] Unable to convert from SDF version 1.6 to 1.4
Warning [parser.cc:478] XML Attribute[frame] in element[pose] not defined in SDF, ignoring.
Error [parser.cc:697] XML Element[torsional], child of element[friction] not defined in SDF. Ignoring.[friction]
Error [parser.cc:688] Error reading element
Error [parser.cc:688] Error reading element
Error [parser.cc:688] Error reading element
Error [parser.cc:688] Error reading element
Error [parser.cc:688] Error reading element
Error [parser.cc:688] Error reading element
Error [parser.cc:348] Unable to read element
Error: Could not find the 'robot' element in the xml file
at line 81 in /build/buildd/urdfdom-0.2.10+dfsg/urdf_parser/src/model.cpp
Error [parser_urdf.cc:2608] Unable to call parseURDF on robot model
Error [parser.cc:273] parse as old deprecated model file failed.
Error [Server.cc:300] Unable to read sdf file[/home/jaypan/Documents/turtlebot_ws/src/trajectory_tracking/worlds/squared_room.world]
gzserver: /usr/include/boost/thread/pthread/recursive_mutex.hpp:101: boost::recursive_mutex::~recursive_mutex(): Assertion `!pthread_mutex_destroy(&m)' failed.
Aborted (core dumped)
[gazebo-2] process has died [pid 25729, exit code 134, cmd /opt/ros/indigo/lib/gazebo_ros/gzserver -e ode /home/jaypan/Documents/turtlebot_ws/src/trajectory_tracking/worlds/squared_room.world __name:=gazebo __log:=/home/jaypan/.ros/log/31cceedc-73ac-11e7-8704-80a589808863/gazebo-2.log].
log file: /home/jaypan/.ros/log/31cceedc-73ac-11e7-8704-80a589808863/gazebo-2*.log
..^C[depthimage_to_laserscan-10] killing on exit
[laserscan_nodelet_manager-9] killing on exit
[robot_state_publisher-8] killing on exit
[bumper2pointcloud-7] killing on exit
[cmd_vel_mux-6] killing on exit
[mobile_base_nodelet_manager-5] killing on exit
[spawn_turtlebot_model-4] killing on exit
[gazebo_gui-3] killing on exit
Traceback (most recent call last):
File "/opt/ros/indigo/lib/gazebo_ros/spawn_model", line 301, in
sm.callSpawnService()
File "/opt/ros/indigo/lib/gazebo_ros/spawn_model", line 267, in callSpawnService
initial_pose, self.reference_frame, self.gazebo_namespace)
File "/opt/ros/indigo/lib/python2.7/dist-packages/gazebo_ros/gazebo_interface.py", line 28, in spawn_urdf_model_client
rospy.wait_for_service(gazebo_namespace+'/spawn_urdf_model')
File "/opt/ros/indigo/lib/python2.7/dist-packages/rospy/impl/tcpros_service.py", line 159, in wait_for_service
raise ROSInterruptException("rospy shutdown")
rospy.exceptions.ROSInterruptException: rospy shutdown
[rosout-1] killing on exit
[master] killing on exit
shutting down processing monitor...
... shutting down processing monitor complete
done
Can you help me fix this issue? Thank you!