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Make sure that the you have the "map.yaml" and "map.pgm" inside the maps folder, which in turn is inside the "turtlebot3_navigation" package.

If this is correct, open the "map.yaml" and make sure that you have the following line pointing correctly to the right image file:

image: map.pgm

Make sure that the you have the "map.yaml" and "map.pgm" inside the maps "maps" folder, which in turn is inside the "turtlebot3_navigation" package.

If this is correct, open the "map.yaml" and make sure that you have the following line pointing correctly to the right image file:

image: map.pgm