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Open bashrc file;

nano ~/.bashrc

Add this to the end;

source ~/catkin_ws/devel/setup.bash

Then save and quit.

If it works, you fixed it.

If it doesn't work, you can add it to the bottom of the bashrc file;

export ROS_PACKAGE_PATH=/home/<user_name>/catkin_ws/src:/opt/ros/melodic/share

<user_name> -> write your own user name in this section

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