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The warning means that another node with the same name has been started. In ROS, node names need to be unique, and the convention is that when a new node with the same name is started, the old one should exit.

Presumably, you create a NodeConfiguration somewhere in order to start your talker node. There, you can change the node name using the following method:

nodeConfiguration.setNodeName("node")

You should make sure you set a different name for both talker instances.

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