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Error details
I did Everything correctly. I pasted the given code in move_bb8_square and changed file permissions but still not working.
Hi @adnanghafoor883, welcome to the community!
In order to know what is going on, we need more context. The file you are trying to run might be empty, the package uncompiled, etc:
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Is your file empty? Please share the code you are running.
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Is your package compiled? If not, go to the workspace, compile and source:
cd ~/catkin_ws
catkin_make
source devel/setup.bash
rospack profile
You can verify that the package is compiled by running roscd move_bb8_pkg (or any other package).