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After a lot of debugging, I realised this error was due to sourcing my catkin_ws (I had used the packages directly in catkin_ws rather than installing). Basically, I was getting this error at the start of the terminal because my .bashrc had export of my catkin_ws setup. So, I localised the issue to my catkin_ws. After exploring the filesystem of my catkin_ws, I found some .sh files under the directory catkin_ws/devel/etc/catkin/profile.d/ which belonged to turtlebot. Deleting those specific files solved my problem.