Simulation environment problem

ROSDS Support
1

Hi,
I’m currently working on the Wall Follower project from the ROS Basics in 5 Days: Course Project, but I’m having some issues getting the simulation environment to run properly.

When I try to launch the simulation using: “roslaunch realrobotlab main.launch”
I get this error: “RLException: [main.launch] is neither a launch file in package [realrobotlab] nor is [realrobotlab] a launch file name
The traceback for the exception was written to the log file”``

I also ran rospack list, and it looks like there’s no package called realrobotlab in the workspace.
Right now, the simulation environment doesn’t load — Gazebo just shows a blank screen and no robot appears. Because of this, I can’t test or move forward with the wall following behavior.

Could you please help me get the simulation working again? I’d really appreciate any guidance so I can continue with the project and eventually test it on the real robot.

2

Try doing

$ sudo apt update 

$ sudo apt upgrade

Not sure if that will work though

3

This error happens when you have not sourced the right workspace. Did you run the source command before the roslaunch command?

4

I tried that; It didn’t work!
I’m not sure if the realrobotlab* package is still part of my local catkin_ws`

user:~$ source ~/catkin_ws/devel/setup.bashuser:~$ roslaunch realrobotlab main.launch
RLException: [main.launch] is neither a launch file in package [realrobotlab] nor is [realrobotlab] a launch file name
The traceback for the exception was written to the log file
user:~$ cd ~/catkin_ws
user:~/catkin_ws$ source devel/setup.bash
user:~/catkin_ws$ roslaunch realrobotlab main.launch
RLException: [main.launch] is neither a launch file in package [realrobotlab] nor is [realrobotlab] a launch file name
The traceback for the exception was written to the log file
user:~/catkin_ws$ source ~/catkin_ws/devel/setup.bash && roslaunch realrobotlab main.launch
RLException: [main.launch] is neither a launch file in package [realrobotlab] nor is [realrobotlab] a launch file name
The traceback for the exception was written to the log file
user:~/catkin_ws$ rospack list | grep realrobotlab
user:~/catkin_ws$ cd ~/catkin_ws/src
user:~/catkin_ws/src$ ls
CMakeLists.txt scan_test wall_follower

user:~/catkin_ws/src$ source /home/user/catkin_ws/devel/setup.bash
user:~/catkin_ws/src$ roscd realrobotlab
roscd: No such package/stack ‘realrobotlab’
user:~/catkin_ws/src$

5

I apologize - the source command is missing from the notebook. The simulation is in the ~/simulation_ws workspace. The source command is:

source ~/simulation_ws/devel/setup.bash

It works after sourcing this workspace. We’ll look into fixing that notebook.