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You are not doing anything wrong. This is a bug with plugins to image_transport - under the right conditions their dynamic_reconfigure services can collide, producing those errors. It's ticketed at https://code.ros.org/trac/ros-pkg/ticket/4883.

The error output is annoying but in practice doesn't cause much harm, so this has been a low-priority item.

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You are not doing anything wrong. This is a bug with plugins to image_transport - under the right conditions their dynamic_reconfigure services can collide, producing those errors. It's ticketed at https://code.ros.org/trac/ros-pkg/ticket/4883.https://code.ros.org/trac/ros-pkg/ticket/4883 .

The error output is annoying but in practice doesn't cause much harm, so this has been a low-priority item.