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In the launch file, instead of <node pkg="map_server" name="map_server" type="map_server" args="``rospack find follow_me_2dnav``/launch/mylaserdata_1503201800.yaml" />

use this <node pkg="map_server" name="map_server" type="map_server" args="$(find follow_me_2dnav)/launch/mylaserdata_1503201800.yaml" />

For more details : link text
$(find pkg) is the right way to use the override behaviour.

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