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I put the entire output (there are a couple of warn message too):

franco@franco-dv6:~/ros_workspace/hector_quadrotor$ roslaunch hector_quadrotor_demo outdoor_flight_gazebo.launch ... logging to /home/franco/.ros/log/352e3458-c05d-11e1-b2e2-0026c60ec908/roslaunch-franco-dv6-3497.log Checking log directory for disk usage. This may take awhile. Press Ctrl-C to interrupt Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://franco-dv6:56736/

SUMMARY

PARAMETERS * /ground_truth_to_tf/frame_id * /ground_truth_to_tf/odometry_topic * /robot_description * /robot_state_publisher/publish_frequency * /robot_state_publisher/tf_prefix * /rosdistro * /rosversion * /use_sim_time

NODES / gazebo (gazebo/gazebo) ground_truth_to_tf (odometry_to_tf/odometry_to_tf) robot_state_publisher (robot_state_publisher/state_publisher) rviz (rviz/rviz) spawn_robot (gazebo/spawn_model)

ROS_MASTER_URI=http://localhost:11311

core service [/rosout] found Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in <module 'threading'="" from="" '="" usr="" lib="" python2.7="" threading.pyc'=""> ignored

process[gazebo-1]: started with pid [3520] Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in <module 'threading'="" from="" '="" usr="" lib="" python2.7="" threading.pyc'=""> ignored

process[spawn_robot-2]: started with pid [3528]

Gazebo multi-robot simulator, version 1.0.2

Copyright (C) 2011 Nate Koenig, John Hsu, Andrew Howard, and contributors. Released under the Apache 2 License. http://gazebosim.org

Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in <module 'threading'="" from="" '="" usr="" lib="" python2.7="" threading.pyc'=""> ignored

process[robot_state_publisher-3]: started with pid [3538]

As a workaround, you can add an extra dummy link to your URDF. Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in <module 'threading'="" from="" '="" usr="" lib="" python2.7="" threading.pyc'=""> ignored

rocess[ground_truth_to_tf-4]: started with pid [3561]

33mWarning [parser.cc:332] Gazebo SDF has no gazebo element

Warning [parser.cc:243] parser for sdf version 1.0 failed, trying to parse as old deprecated format

Msg Waiting for master

Msg Connected to gazebo master @ http://localhost:11345

Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in <module 'threading'="" from="" '="" usr="" lib="" python2.7="" threading.pyc'=""> ignored

process[rviz-5]: started with pid [3594]

Config file '/home/franco/.rviz/config' could not be opened for reading.

gzserver: /home/franco/Gazebo/ogre_src_v1-7-4/OgreMain/include/OgreSingleton.h:80: Ogre::Singleton<t>::Singleton() [with T = Ogre::TerrainPageSourceListenerManager]: Assertion `!ms_Singleton' failed. Aborted (core dumped)

================================================================================REQUIRED process [gazebo-1] has died!

process has died [pid 3520, exit code 134, cmd /opt/ros/fuerte/stacks/simulator_gazebo/gazebo/scripts/gazebo /home/franco/ros_workspace/hector_gazebo/hector_gazebo_worlds/worlds/rolling_landscape_120m.world __name:=gazebo __log:=/home/franco/.ros/log/352e3458-c05d-11e1-b2e2-0026c60ec908/gazebo-1.log]. log file: /home/franco/.ros/log/352e3458-c05d-11e1-b2e2-0026c60ec908/gazebo-1*.log Initiating shutdown!

================================================================================

loading model xml from ros parameter

[rviz-5] killing on exit

[ground_truth_to_tf-4] killing on exit

[robot_state_publisher-3] killing on exit

[spawn_robot-2] killing on exit

[gazebo-1] killing on exit

Traceback (most recent call last):

File "/opt/ros/fuerte/stacks/simulator_gazebo/gazebo/scripts/spawn_model", line 293, in <module> sm.callSpawnService()

File "/opt/ros/fuerte/stacks/simulator_gazebo/gazebo/scripts/spawn_model", line 239, in callSpawnService rospy.wait_for_service('/gazebo/get_physics_properties')

File "/opt/ros/fuerte/lib/python2.7/dist-packages/rospy/impl/tcpros_service.py", line 158, in wait_for_service raise ROSInterruptException("rospy shutdown")

rospy.exceptions.ROSInterruptException: rospy shutdown

shutting down processing monitor... ... shutting down processing monitor complete done