I did everything according to the cource, but I encountered the following problem when I try to start “my_cartpole_training”:
user:/$ roslaunch my_cartpole_training start_training.launch
[start_training.launch] is neither a launch file in package [my_cartpole_training] nor is [my_cartpole_training] a launch file name
I also get an error when I try: user:/$ roscd my_cartpole_training
roscd: No such package/stack ‘my_cartpole_training’
What did I wrong?