ROBOT not moving on gazebo

[moroaolado]

Hi everyone, i'm having an issue trying to move the robot on gazebo, I followed all the instructions of the videos and the troubleshoot, but it doesn't move, only tried it with the keyboard. I didn't change anything in the folders before trying, so, apparently the code here in github may be with the problem, is there anything to change? any value?
FYI: I'm new to ROS

[amoljamble1]

return LaunchDescription([
        rsp,
        #joystick,
        #twist_mux,
        gazebo,
        spawn_entity,
        diff_drive_spawner,
        joint_broad_spawner
    ])   

inside robot_sim.launch.py comment joystick and twist_mux and try with
ros2 run teleop_twist_keyboard teleop_twist_keyboard .