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"Have you called init_node()?"

asked 2012-04-12 02:15:43 -0500

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hi everyone, when I'm trying to do the tutorial in http://www.ros.org/wiki/ROS/Tutorials/WritingPublisherSubscriber%28python%29 , I have a problem when I try to execute

rosrun beginner_tutorials talker.py

The error message is :

luigi@luigi-pc:~/ros_workspace/beginner_tutorials$ rosrun beginner_tutorials talker.py
Traceback (most recent call last):
  File "/home/luigi/ros_workspace/beginner_tutorials/nodes/talker.py", line 11, in <module>
    str = "hello world %s"%rospy.get_time()
  File "/opt/ros/electric/stacks/ros_comm/clients/rospy/src/rospy/rostime.py", line 222, in get_time
    return Time.now().to_sec()
  File "/opt/ros/electric/stacks/ros_comm/clients/rospy/src/rospy/rostime.py", line 150, in now
    raise rospy.exceptions.ROSInitException("time is not initialized. Have you called init_node()?")
rospy.exceptions.ROSInitException: time is not initialized. Have you called init_node()?

Anyone Can help me??

Thank you in advance

Luigi

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Comments

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Can you please post your python code? It at least differs somehow since the error comes in line 11 and not in line 9 which should be the str = ... line when you directly copy-pasted the code from the tutorial.

Lorenz gravatar image Lorenz  ( 2012-04-12 05:48:44 -0500 )edit

yes Lorenz, here it is :

palmlster gravatar image palmlster  ( 2012-04-13 02:17:15 -0500 )edit

in that page you can find the used code :)

palmlster gravatar image palmlster  ( 2012-04-13 02:24:49 -0500 )edit

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answered 2012-05-14 20:59:31 -0500

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You need to indent the while loop so that it becomes part of the function talker. Right now, the while loop is getting executed, and talker is never called.

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Asked: 2012-04-12 02:15:43 -0500

Seen: 2,298 times

Last updated: May 14 '12