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I solved it, its silly mistake

When I run gedit ~/.bashrc in a terminal, there is no path in .bashcr file.

I just added the following two lines at the end of the file. Note/ this is for my path source, the path must be slightly different. The data between <.....> should be different.

source /opt/ros/<kinetic>/setup.bash
source /<home/abdulrahman/catkin_ws>/devel/setup.bash

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