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This error message is trying to tell you that it expects your callback to take a boost::shared_ptr (or the ConstPtr message subtype) for the first argument; not a reference to a object.

Try this instead:

void callback(const geometry_msgs::PoseWithCovarianceStampedConstPtr& pose_1, const geometry_msgs::PoseWithCovarianceStampedConstPtr& pose_2)

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