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ROS tf tutorial error

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Jul 3rd, 2017
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  1. $ roslaunch learning_tf start_demo.launch
  2. ... logging to /home/username/.ros/log/027e6808-601b-11e7-9409-cc3d82b9eef7/roslaunch-hostname-14033.log
  3. Checking log directory for disk usage. This may take awhile.
  4. Press Ctrl-C to interrupt
  5. Done checking log file disk usage. Usage is <1GB.
  6.  
  7. started roslaunch server http://hostname:33610/
  8.  
  9. SUMMARY
  10. ========
  11.  
  12. PARAMETERS
  13. * /rosdistro: kinetic
  14. * /rosversion: 1.12.7
  15. * /turtle1_tf_broadcaster/turtle: turtle1
  16. * /turtle2_tf_broadcaster/turtle: turtle2
  17.  
  18. NODES
  19. /
  20. broadcaster_fixed (learning_tf/fixed_tf_broadcaster.py)
  21. sim (turtlesim/turtlesim_node)
  22. teleop (turtlesim/turtle_teleop_key)
  23. turtle1_tf_broadcaster (learning_tf/turtle_tf_broadcaster.py)
  24. turtle2_tf_broadcaster (learning_tf/turtle_tf_broadcaster.py)
  25. turtle_tf_listener (learning_tf/turtle_tf_listener.py)
  26.  
  27. auto-starting new master
  28. process[master]: started with pid [14044]
  29. ROS_MASTER_URI=http://localhost:11311
  30.  
  31. setting /run_id to 027e6808-601b-11e7-9409-cc3d82b9eef7
  32. process[rosout-1]: started with pid [14057]
  33. started core service [/rosout]
  34. process[sim-2]: started with pid [14065]
  35. process[teleop-3]: started with pid [14075]
  36. process[turtle1_tf_broadcaster-4]: started with pid [14076]
  37. Reading from keyboard
  38. ---------------------------
  39. Use arrow keys to move the turtle.
  40. process[turtle2_tf_broadcaster-5]: started with pid [14090]
  41. process[turtle_tf_listener-6]: started with pid [14091]
  42. process[broadcaster_fixed-7]: started with pid [14092]
  43. Traceback (most recent call last):
  44. File "/home/username/catkin_ws/src/learning_tf/nodes/turtle_tf_listener.py", line 32, in <module>
  45. listener.waitForTransform('/turtle2', '/carrot1', now, rospy.Duration(1.0))
  46. tf.Exception: Lookup would require extrapolation into the past. Requested time 1499105474.036746979 but the earliest data is at time 1499105479.002878904, when looking up transform from frame [carrot1] to frame [turtle2]. canTransform returned after 1.00482 timeout was 1.
  47. [WARN] [1499105480.196388]: Inbound TCP/IP connection failed: connection from sender terminated before handshake header received. 0 bytes were received. Please check sender for additional details.
  48. [turtle_tf_listener-6] process has died [pid 14091, exit code 1, cmd /home/username/catkin_ws/src/learning_tf/nodes/turtle_tf_listener.py __name:=turtle_tf_listener __log:=/home/username/.ros/log/027e6808-601b-11e7-9409-cc3d82b9eef7/turtle_tf_listener-6.log].
  49. log file: /home/username/.ros/log/027e6808-601b-11e7-9409-cc3d82b9eef7/turtle_tf_listener-6*.log
  50. [broadcaster_fixed-7] killing on exit
  51. [turtle2_tf_broadcaster-5] killing on exit
  52. [turtle1_tf_broadcaster-4] killing on exit
  53. [teleop-3] killing on exit
  54. [sim-2] killing on exit
  55. [rosout-1] killing on exit
  56. [master] killing on exit
  57. shutting down processing monitor...
  58. ... shutting down processing monitor complete
  59. done
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