[ROS Navigation in 5 Days]->rosject [Course Project: Navigate with a Real Robot!]

I am building the map with the instructions. Everything looks good but the map can not be shown as rviz indicates “No map received”. Refer to the picture. How to resolve this issue?

Issue was resolved by deleting:
< param name=“base_frame” value=“ADD FRAME” />
< param name=“odom_frame” value=“ADD FRAME” />
from the demo launch file.

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