Problem with gen_msg_map_path prevents unifiedbeat from starting,

I get the following logs when trying to start unifiedbeat:

[snort@host ~]$ /usr/local/bin/unifiedbeat -c /etc/unifiedbeat/unifiedbeat-0.yml -v -d "*" -e
2016/04/06 18:20:40.500795 filter.go:41: DBG  configuration []
2016/04/06 18:20:40.500836 filter.go:52: DBG  filters:
2016/04/06 18:20:40.500844 beat.go:193: DBG  Filters:
2016/04/06 18:20:40.501114 beat.go:216: INFO Setup Beat: unifiedbeat; Version: 2.0.1
2016/04/06 18:20:40.501123 beat.go:218: DBG  Initializing output plugins
2016/04/06 18:20:40.501132 geolite.go:24: INFO GeoIP disabled: No paths were set under shipper.geoip.paths
2016/04/06 18:20:40.501163 file.go:42: INFO File output path set to: /var/log/snort
2016/04/06 18:20:40.501172 file.go:43: INFO File output base filename set to: eth0-0-alerts.json
2016/04/06 18:20:40.501178 file.go:46: INFO Rotate every bytes set to: 10485760
2016/04/06 18:20:40.501183 file.go:50: INFO Number of files set to: 7
2016/04/06 18:20:40.501206 outputs.go:87: INFO Activated file as output plugin.
2016/04/06 18:20:40.501214 publish.go:231: DBG  Create output worker
2016/04/06 18:20:40.501271 publish.go:273: DBG  No output is defined to store the topology. The server fields might not be filled.
2016/04/06 18:20:40.501311 publish.go:287: INFO Publisher name: fsb-07.berkeley.edu
2016/04/06 18:20:40.501832 async.go:68: INFO Flush Interval set to: -1s
2016/04/06 18:20:40.501841 async.go:69: INFO Max Bulk Size set to: -1
2016/04/06 18:20:40.501879 u2beat.go:97: CRIT Setup: ERROR: required path to 'gen_msg_map_path' not specified in YAML config file!

This confuses me, as I do have "gen_msg_map_path" defined in my configuration file.

sensor:

  # where are the unified2 files for this sensor:
  unified2_path: "/data/snort/snort/logs/eth0-0/u2"

  # what is the unified2 filename prefix, which may be anything,
  # but there is no globbing, so do not use "*" on the end:
  unified2_prefix: "merged.log"

  # use GeoLite2 or GeoIP2 database for both IPv4/6 addresses:
  geoip2_path: "/usr/share/GeoIP/GeoLite2-City.mmdb"

  # where are the Rules (signatures):
  rules:
    # gen_msg_map must be a single file reference, no glob's
    gen_msg_map_path: "/data/snort/snort/etc/gen-msg.map"

    # rules path may be a glob
    # make sure no file is defined twice as this can
    # lead to lots of duplicate rule warnings:
    paths:
      - "/data/snort/snort/etc/rules/*.rules"

  # add fixed/known details about this sensor:
  fields:
    sensor_hostname: hostname
    sensor_interface: eth0-0
    sensor_type: snort

  fields_under_root: true

############################# Output ##########################################

# Configure what outputs to use when sending the data collected by the beat.
# Multiple outputs may be used.
output:

  ### File as output
  file:
    # Path to the directory where to save the generated files. The option is mandatory.
    path: "/var/log/snort"

    # Name of the generated files. The default is `unifiedbeat` and it generates files: `unifiedbeat`, `unifiedbeat.1`, `unifiedbeat.2`, etc.
    filename: eth0-0-alerts.json

############################# Logging #########################################

# There are three options for the log ouput: syslog, file, stderr.
# Under Windows systems, the log files are per default sent to the file output,
# under all other system per default to syslog.
logging:

  # Write all logging output to files. Beats automatically rotate files if rotateeverybytes
  # limit is reached.
  to_files: true

  # To enable logging to files, to_files option has to be set to true
  files:
    # The directory where the log files will written to.
    path: "/var/log/snort"

    # The name of the files where the logs are written to.
    name: eth0-0-log.log

    # Configure log file size limit. If limit is reached, log file will be
    # automatically rotated
    rotateeverybytes: 10485760 # = 10MB

    # Number of rotated log files to keep. Oldest files will be deleted first.
    # note: if set to 0 then libbeat sets it to 7 (why?)
    keepfiles: 2

  # Enable debug output for selected components. To enable all selectors use ["*"]
  # Other available selectors are beat, publish, service
  # Multiple selectors can be chained.
  # selectors: ["*"]

  # Sets log level. The default log level is error.
  # Available log levels are: critical, error, warning, info, debug
  level: info

Confirming the gen_msg_map exists and the user has read permissions

[root@host snort]# file /data/snort/snort/etc/gen-msg.map
/data/snort/snort/etc/gen-msg.map: ASCII C program text

Unifiedbeat's configtest doesn't return any errors:

[snort@host ~]$ /usr/local/bin/unifiedbeat -c /etc/unifiedbeat/unifiedbeat-0.yml  --configtest

I checked unifiedbeat-0.yml with a different YAML parser and got no errors. Additionally, the parser did have the correct value for the key sensor.rules.gen_msg_map_path

I'm encountering this issue on a fully updated RedHat 6.7 system.

Any help would be greatly appreciated.

cleesmith / unifiedbeat

Problem with gen_msg_map_path prevents unifiedbeat from starting, #5