I am trying to run rosrun script forward.py but it gives me an error saying [rospack] Error: package 'script' not found

In my bashrc I've added these lines:

source /opt/ros/indigo/setup.bash
source /home/hassan/catkin_ws/devel/setup.bash
export ROS_PACKAGE_PATH=/home/home/catkin_ws:/opt/ros/indigo/share:/opt/ros/indigo/stacks
export ROS_WORKSPACE=/home/hassan/catkin_ws


What could be the reason? I am following this video: https://www.youtube.com/watch?v=zwTnY-ZqNcM&t=102s

• You haven't compiled all your projects in the workspace, to fix it go to your workspace cd ~/catkin_ws then execute catkin_make. If it works and you don't have compilation errors, source your workspace source ~/catkin_ws/devel/setup.bash, then re-try.
• When you are typing rosrun script forward.py, you expect to launch the script forward.py from the package script. Check if your folder ~/catkin_ws/src/script exists, if not this cannot work!