Odd Configuration.yaml Error With Check

Trying to add camera functionality to my Hassio install under version 2.11. When I run Check from CLI, I get the following error:

Error: Testing configuration at /config
ERROR:homeassistant.util.yaml:YAML file /config/configuration.yaml contains duplicate key "camera". Check lines 39 and 56.

No duplication of key “camera” exists and line numbers don’t make sense. Configuration.yaml file looks like:

homeassistant:
  # Name of the location where Home Assistant is running
  name: Home
  # Location required to calculate the time the sun rises and sets
  latitude: ############
  longitude: ############
  # Impacts weather/sunrise data (altitude above sea level in meters)
  elevation: 0
  # metric for Metric, imperial for Imperial
  unit_system: imperial
  # Pick yours from here: http://en.wikipedia.org/wiki/List_of_tz_database_time_zones
  time_zone: America/New_York
  # Customization file
  customize: !include customize.yaml

# Configure a default setup of Home Assistant (frontend, api, etc)
default_config:

# Uncomment this if you are using SSL/TLS, running in Docker container, etc.
# http:
#   base_url: example.duckdns.org:8123

# Discover some devices automatically
discovery:

# Support for Z-wave via Nortek
zwave:
  usb_path: /dev/ttyAMA1

# ZigBee Support via Nortek (HUSBZB-1)
zha:
  usb_path: /dev/ttyAMA1
  database_path: /config/zigbee.db

# Sensors
sensor:
  # Weather prediction
  - platform: yr

# Text to speech
tts:
  - platform: google_translate

group: !include groups.yaml
automation: !include automations.yaml
script: !include scripts.yaml
camera: !include cameras.yaml
zone: !include zones.yaml

My cameras.yaml contains the following:

stream:


platform: mjpeg
name: Steps
mjpeg_url: http://192.168.29.112:8668/videostream.cgi?user=user1&pwd=secret_pwd

#ffmpeg:
#  ffmpeg_bin: /usr/bin/ffmpeg

Any ideas on how to resolve this?

This should be in configuration yaml, not under the camera domain.