RLException: [xx.launch] is neither a launch file in package [x] nor is [x] a launch file name的解决方法

During the ROS learning process, I encountered a problem: RLException: [xx.launch] is neither a launch file in package [x] nor is [x] a launch file name

The problem that arises:

In ROS learning, when compiling under the workspace, an error is suddenly reported, and the error is as follows :

RLException: [racecar.launch] is neither a launch file in package [racecar_gazebo] nor is [racecar_gazebo] a launch file name
The traceback for the exception was written to the log file

This error occurs because the environment variable has not been added! ! !

solution

You can add environment variables to
add environment variables is not the only way

Here are two methods, both of which have their own advantages

method one

Make sure to execute it when creating the workspacecatkin_make

Directly on the command line, enter the workspace, and execute the following command:

source ./devel/setup.bash

In this way, you can directly operate on the command line, and it looks relatively simple in a short time. Straighten it out every time you're not sure source.

Method Two

Modify the environment variable file directly

1. Open the file ./bashrc on the command line, the command is as follows:

sudo  gedit ~/.bashrc

1. Add the following statement at the end of the file:

source ~/work_ws/devel/setup.bash
export ROS_PACKAGE_PATH=${ROS_PACKAGE_PATH}:~/work_ws/

Note: It is worth noting that work_ws here is the path of my ROS work, which is your ros workspace

3. Restart bashrc and directly execute the following statement

source ~/.bashrc

4. Check if the ROS path is added

echo $ROS_PACKAGE_PATH

If the setting is successful, the added path will be displayed directly.

OVER！！！