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You should take a further review on the example launch file and fully understand what does. It calls the urdf and yaml yes and load them to the parameter server, But also calls epos_harware_node, without having more information about your launch file, urdfs and yamls it is a bit difficult to predict what is wrong.

Before I would be also check the output on list_devices node and be sure that everything is being detected, for further help you should specify more about the contex of your problem (devices etc)