RLException: [mav.launch] is neither a launch file in package [rotors_gazebo] nor is [rotors_gazebo] a launch file name

Dear Support,
Error: RLException: [mav.launch] is neither a launch file in package [rotors_gazebo] nor is [rotors_gazebo] a launch file name

Following command typically works: source devel/setup.bash

BUT is not working today … any pointers …
I have checked the name in the package.xml

Please advise…
Thanks
-R

export ROS_PACKAGE_PATH=/home/user/catkin_ws/src:/home/simulations/public_sim_ws/src/:/opt/ros/noetic/share

Found this in another community post, General support…
THanks
-R

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