Exercise 5.9 syntax error

So, I found a simple error in exercise 5.9, following the instructions is passed to copy the costmap_common.yaml file from the husky_navigation package, and put it in your file.yaml, but in the delivery it has a syntax error.

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Thank you for calling the out. We will look into the error.

Actually I found that the file was correct in the source. Perhaps the error happened somewhere else:

user:~$ roscd husky_navigation
user:/home/simulations/public_sim_ws/src/all/husky/husky/husky_navigation$ cat config/costmap_common.yaml
footprint: [[-0.5, -0.33], [-0.5, 0.33], [0.5, 0.33], [0.5, -0.33]]
footprint_padding: 0.01

robot_base_frame: base_link
update_frequency: 4.0
publish_frequency: 3.0
transform_tolerance: 0.5

resolution: 0.05

#layer definitions
    map_topic: /map
    subscribe_to_updates: true

    observation_sources: laser
    laser: {data_type: LaserScan, clearing: true, marking: true, topic: scan, inf_is_valid: true, obstacle_range: 5.5}

    inflation_radius: 1.0