Error in python basics robot not moving

Course Support Python Basics For Robotics
1

hi there , i get this error when i lanuch any file

image
image1920×1081 151 KB

can you help me? thanks

3

The error message indicates that the laser scan topic was not ready.

  • Are you using the right scan topic? Run the following command and check if the specified topic is in the list
rostopic list
4

i was told to make another form , kindly check the new one. thanks