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I suspect you're specifying the namespace in too many places, and putting the resulting parameters in the wrong place.
To start, I would run your launch file in one terminal and then run rosparam list
in another terminal to look at the parameters that you're actually creating.
I can see a couple ways to fix this:
ns="costmap"
argument to your rosparam tagcostmap:
namespace from your yaml fileFor reference, I have this working for my robot: local_costmap.launch and local_costmap.yaml