"Waiting for the map" when using map_server and rosbag

Hello, I'm currently doing the tutorial [teb_local_planner](http://wiki.ros.org/teb_local_planner/Tutorials) and now I'm trying to build a map with this [tutorial](http://wiki.ros.org/slam_gmapping/Tutorials/MappingFromLoggedData). I execute all commands and at the end of this, I have problem with this command : ~/Documents/pts-info2-master/mybot_ws-base_sensors/src$ rosrun map_server map_saver -f my_map [ INFO] [1553269724.865617557]: Waiting for the map I never get the map and I must kill the process. I use Velodyne, Ubuntu 16.04 with ROS Kinetic distribution. Thanks.