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No /clock topic being published when running map_server map_saver

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Hello, I have been following the ROS gmapping tutorial, *How to Build a Map Using Logged Data*, and have run into a problem where the sim clock is not being published when I try to save a map from a bag file. - I set the ues_sim_time parameter to true. - Am running gmapping slam_gmapping. - The bag file succesfully played back using: rosbag play --clock myBagFile.bag - but after processing the bag file, I use rosrun map_server map_saver -f myMap and I get the message: *Waiting for the map* The /Clock topic is not being published. Isn't map_server map_saver supposed to publish the /clock topic? **From roswtf:** WARNING The following node subscriptions are unconnected: * /slam_gmapping: * /tf_static * /clock * /scan * /rostopic_5755_1528131980494: * /clock * /map_saver: * /clock WARNING No tf messages Found 1 error(s). ERROR /use_simtime is set but no publisher of /clock is present

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