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So i was able to solve my error by deleting the content inside the BUILD folder and then do catkin_make. So the problem is solved for now and also there was a folder named name python3 in ~/catkin_ws/devel/lib/python3 which reappeared every time i do catkin_make no matter how many times i deleted the folder manually. This time i deleted and it never reappeared. I even removed the manually added PYTHONPATH in my ~/.bashrc so now the echo $PYTHONPATH is /home/username/catkin_ws/devel/lib/python2.7/dist-packages:/opt/ros/kinetic/lib/python2.7/dist-packages which I believe is the correct PYTHONPATH. Thanks @gvdhoorn & @Abhishekpg111 for your suggestions.