Issue with rosmsg when running master_discovery

[akhilveeraghanta]

Steps to reproduce: ROS_IP=127.0.0.1 ROS_MASTER_URI=http://localhost:11311 roscore & rosrun master_discovery_fkie master_discovery & rosrun master_sync_fkie master_sync &

And this exception happens: Stack trace:

Exception in thread Thread-14:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 754, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/rospy/impl/tcpros_service.py", line 660, in handle
    requests = transport.receive_once()
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/rospy/impl/tcpros_base.py", line 743, in receive_once
    raise TransportException("receive_once[%s]: DeserializationError %s"%(self.name, str(e)))
TransportException: receive_once[/master_sync/get_sync_info]: DeserializationError cannot deserialize: unknown error handler name 'rosmsg'

Ive sourced /opt/ros/kinetic/setup.bash and all the other ros nodes work perfectly. Calling rosservice call /master_discovery/list_masters directly also raises the same exception

Also all other service like /master_sync/get_loggers work fine, and every other service on other nodes work fine.

[atiderko]

Hi, I cannot reproduce this error. This error is a bit strange, because I don't use rosmsg either in master_discovery or master_sync.

How did you install multimaster, via debian packages or from source?

Did you try to install ros-kinetic-rosmsg?

[akhilveeraghanta]

Thank you for the fast response, we just upgraded all the packages and it worked again. Must have been some weird dependency mismatch.

[atiderko]

Thank you for letting me know!