Rviz: no map received

I got the error “no map received” whenever i launch rviz on the project part

Hello @HelenaShappe,

Are you launching the map_server node? Can you make sure that you have the /map topic published? And if so, do you have the transform from the map frame to the robot’s base frame? (You can check this by visualizing the robot’s TF tree with the command rosrun tf view_frames).