Problem of dependencies not found in TF 101 - Unit 2 and Unit 3

Thats an oddly strange issue. I just tried it here and no issue. Maybe there is something wrong in your catkin_ws? Did you remove or compile something and gave error?
Could you do the following:

echo $ROS_PACKAGE_PATH

You should get this path:

/home/user/catkin_ws/src:/home/simulations/public_sim_ws/src:/opt/ros/kinetic/share

This allows the ros system to find all the packages.

Also, remove everything you have in the /home/user/catkin_ws/src, (EXCEPT for the Cmakelitsts.txt ) , andtry to do:

cd /homeUser/catkin_ws; rm -rf build devel; source /home/simulations/public_sim_ws/devel/setup.bash; catkin_make

This would reset the catkin_ws with its original state, just in case, something went wrong in the comilation.

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