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Gmapping Husky no map received

Hello, I am new to ROS and trying to do SLAM with my husky Robot. I am trying to launch gmapping_demo as shown in this link: using the real robot (not simulation). Anyway, the gmapping node is stuck at "requesting map" and Rviz shows that "no map received". Time is synchronized between my PC and the robot using Chrony, and tf frames tree shows normal connections between /map -> /odom -> /base_link.

Can anyone help me in debugging the problem?