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I don't see a mistake in your URDF files. The gripper's joint_states may not be published. Do you need to start up the action server mentioned in the package?

I don't see a mistake in your URDF files. The gripper's joint_states may not be published. Do you need to start up the action server mentioned in the package?

If that doesn't help, check if the problem is on your machine by trying this package.

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