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I am new to ROS and am going through the tutorials. I have just attempted to start roscore and am receiving the following error:

*auto-starting new master
Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in <module 'threading' from '/usr/lib/python2.7/threading.pyc'> ignored
process[master]: started with pid [3719]
ROS_MASTER_URI=http://localhost:11311/
setting /run_id to 897134ae-b183-11e1-9fcb-00269ed0509d
Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in <module 'threading' from '/usr/lib/python2.7/threading.pyc'> ignored
process[rosout-1]: started with pid [3732]
started core service [/rosout]*

After this last line, it seems that the process hangs. I can input new commands but no output is displayed.

I also ran these commands before running the roscore command:

$ export ROS_HOSTNAME=localhost
$ export ROS_MASTER_URI=http://localhost:11311

Any suggestions would be appreciated.


Originally posted by sl0w on ROS Answers with karma: 6 on 2012-06-08

Post score: 1


Original comments

Comment by joq on 2012-06-08:
Despite the annoying error message, there is nothing apparently wrong here. Roscore is running, so you need to open another terminal window for other commands to have an immediate effect.

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This seems to be the same as this and should be harmless.


Originally posted by dornhege with karma: 31395 on 2012-06-08

This answer was ACCEPTED on the original site

Post score: 0

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