so i did a source /opt/ros/kinetic/setup.bash in the terminal and things stopped working from there i cannot do catkin_make , catkin_make clear or neither can i do rosrun.
The good thing about TheConstruct is that you cant really break anything. Just return to the dashboard and click on the play button on the right hand corner and select close, this will eventually close your session. Then just relaunch the course or ROSjects and you should be reseted again. Also if you change to a unit with a different simulation it will restart the terminals.
thank you so much did as you told me, its back to normal again.