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