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ROS has some kind of a problem. Every time you open up your terminal, after entering into your catkin work space, you need to run this source ~/catkin_ws/devel/setup.bash. So, here is a thing you need to do.

cd ~/catkin_ws
source ~/catkin_ws/devel/setup.bash

Let me know what appears after that.

ROS has some kind of a problem. Every time you open up your terminal, after entering into your catkin work space, you need to run this source ~/catkin_ws/devel/setup.bash. So, here is a thing you need to do.

cd ~/catkin_ws
source ~/catkin_ws/devel/setup.bash

Let me know what appears after that.

Edit 1: September 09. OK. Then, I feel that your problem is related to some setting. Sometimes, accidentally something happens and then things stop working in ROS. In this case, what I do is uninstall ROS and install again and check if the error persist. If you want to try, sometimes it is good otherwise wait for someone else to response.

To remove ROS, you need to run this

 sudo apt-get remove ros-*

Best of luck.