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Someone finally pointed out that my observation_sources were not in the right namespace. The correct yaml format is the following.

obstacle_layer:
  observation_sources: sensorA sensorB sensorC
  sensorA: {}
  sensorB: {}
  sensorC: {}

Someone finally pointed out that my observation_sources were not in the right namespace. The correct yaml format is the following. You have to make sure the observation_sources are under the obstacle_layer namespace like the below.

obstacle_layer:
  observation_sources: sensorA sensorB sensorC
  sensorA: {}
  sensorB: {}
  sensorC: {}

Someone finally pointed out that my observation_sources were not in the right namespace. The correct yaml format is the following. You have to make sure the observation_sources are under the obstacle_layer namespace like the below.

obstacle_layer:
obstacle_layer:  # I was missing this line
  observation_sources: sensorA sensorB sensorC
  sensorA: {}
  sensorB: {}
  sensorC: {}