Unable to find PX4 about px4-avoidance

[rajat2004]

Sorry, my previous answer wasn't clear enough.

Before running the simulation, you need to source the setup.bash script in the catkin workspace using source ~/catkin_ws/devel/setup.bash.

This removed ~/Firmware from ROS_PACKAGE_PATH which was exported in the previous step.
Due to this, ROS was unable to find the px4.launch file located in ~/Firmware/launch

So after having sourced the setup.bash script, just export ROS_PACKAGE_PATH again using
export ROS_PACKAGE_PATH=${ROS_PACKAGE_PATH}:~/Firmware .

I added the commands in the following order in my ~/.zshrc to automatically source the scripts and export the paths everytime the terminal is opened.

source ~/catkin_ws/devel/setup.zsh
source ~/Firmware/Tools/setup_gazebo.bash ~/Firmware ~/Firmware/build/posix_sitl_default
export GAZEBO_MODEL_PATH=${GAZEBO_MODEL_PATH}:~/catkin_ws/src/avoidance/sim/models
export ROS_PACKAGE_PATH=${ROS_PACKAGE_PATH}:~/Firmware

If you are using bash, just replace zsh with bash

[rajat2004]

Problem solved
This was caused as I was setting ROS_PACKAGE_PATH before sourcing ~/catkin_ws/devel/setup.bash which removed ~/Firmware from the path. Exporting the paths after sourcing the setup.bash file solves the problem.

[yc718764666]

Hi, I have the same question with you, could you explain it in more detail? thank you very much.

[yc718764666]

Thank you very much for your reply. I have already solved this kind of problem.