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The node name you use in roslaunch should be the executable name; not the source file name.

Try it without the .cpp:

<node name="turtlebot_coordinates" pkg="xy_pos" type="turtlebot_coordinates" output="screen"> </node>

The node name you use in roslaunch should be the executable name; not the source file name.

Try it without the .cpp:

<node name="turtlebot_coordinates" pkg="xy_pos" type="turtlebot_coordinates" output="screen"> output="screen">
</node>

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