Unclear errors when working with ROS

1. The first place i am giving to a bunch of ROS with Gazebo (this is a simulator). The script is as follows: by the launch file the gazebo starts with the needed world, the robot model are spawned there, and then the controllers are started. You sit in the console, start the launch, look rostopic list – everything is fine, but when trying to listen any topic (rostopic echo /joint_states) – silence.
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