getting this error on launching turtle_tf_demo.launch file, turtle sim window opens but only one of the turtle is moving
File "/opt/ros/melodic/lib/turtletf2/turtletf2listener.py", line 50, in
spawner(4, 2, 0, turtlename)
File "/opt/ros/melodic/lib/python2.7/dist-packages/rospy/impl/tcprosservice.py", line 442, in _call
return self.call(args, *kwds)
File "/opt/ros/melodic/lib/python2.7/dist-packages/rospy/impl/tcprosservice.py", line 532, in call
raise ServiceException("transport error completing service call: %s"%(str(e)))
rospy.service.ServiceException: transport error completing service call: receiveonce[/spawn]: DeserializationError cannot deserialize: unknown error handler name 'rosmsg'
[turtlepointer-6] process has died [pid 16062, exit code 1, cmd /opt/ros/melodic/lib/turtletf2/turtletf2listener.py _name:=turtlepointer _log:=/home/aditya/.ros/log/6cee5f8a-75f3-11eb-b0d7-080027f71a12/turtlepointer-6.log].
log file: /home/aditya/.ros/log/6cee5f8a-75f3-11eb-b0d7-080027f71a12/turtle_pointer-6*.log
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