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Could you describe what the problem is that you are having?

One thing to check is the path to your mesh: cwd for a node is not where there source file is located, but by default is ~/.ros. So relative paths tend to not work so well.

Just to test, I'd replace it with an absolute path.

For a proper solution, you could use rospkg or catkin_pkg to first get the path to the pkg where the resource is located, then concatenate that with the relative path you have now.

Alternatively, you could set the cwd of your node to the pkg dir that contains the resource. See roslaunch/XML/node - Attributes for that.