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Roslaunch to Spawn URDF Robots

BH

I'm working on the 'Using roslaunch to start Gazebo, world files and URDF models' Tutorial and stuck at the '"ROS Service Call" Robot Spawn Method' section. The command of " rosrun gazebo_ros spawn_model -file rospack find MYROBOT_description/urdf/MYROBOT.urdf -urdf -x 0 -y 0 -z 1 -model MYROBOT " results with the following error:

[rospack] Error: package 'MYROBOT_description' not found spawn_model script started Unable to register with master node [http://localhost:11311]: master may not be running yet. Will keep trying.

Awaiting for any advice, Haz88