Please see the log below:

devtool build-image invalid_image_name
Loading cache: 100% |########################################################################################| Time: 0:00:00
Loaded 2819 entries from dependency cache.
Parsing recipes: 100% |######################################################################################| Time: 0:00:00
Parsing of 2044 .bb files complete (2042 cached, 2 parsed). 2821 targets, 447 skipped, 0 masked, 0 errors.
Traceback (most recent call last):
  File "/workdir/intel-iot-refkit/openembedded-core/scripts/devtool", line 351, in <module>
    ret = main()
  File "/workdir/intel-iot-refkit/openembedded-core/scripts/devtool", line 338, in main
    ret = args.func(args, config, basepath, workspace)
  File "/workdir/intel-iot-refkit/openembedded-core/scripts/lib/devtool/build_image.py", line 63, in build_image
    result, outputdir = build_image_task(config, basepath, workspace, image, add_packages)
  File "/workdir/intel-iot-refkit/openembedded-core/scripts/lib/devtool/build_image.py", line 90, in build_image_task
    rd = parse_recipe(config, tinfoil, image, True)
  File "/workdir/intel-iot-refkit/openembedded-core/scripts/lib/devtool/__init__.py", line 138, in parse_recipe
    append_files = tinfoil.get_file_appends(recipefile)
  File "/workdir/intel-iot-refkit/bitbake/lib/bb/tinfoil.py", line 377, in get_file_appends
    return self.run_command('getFileAppends', fn)
  File "/workdir/intel-iot-refkit/bitbake/lib/bb/tinfoil.py", line 316, in run_command
    raise TinfoilCommandFailed(result[1])
bb.tinfoil.TinfoilCommandFailed: Traceback (most recent call last):
  File "/workdir/intel-iot-refkit/bitbake/lib/bb/command.py", line 81, in runCommand
    result = command_method(self, commandline)
  File "/workdir/intel-iot-refkit/bitbake/lib/bb/command.py", line 416, in getFileAppends
    return command.cooker.collection.get_file_appends(fn)
  File "/workdir/intel-iot-refkit/bitbake/lib/bb/cooker.py", line 1961, in get_file_appends
    f = os.path.basename(fn)
  File "/usr/lib/python3.5/posixpath.py", line 139, in basename
    i = p.rfind(sep) + 1
AttributeError: 'NoneType' object has no attribute 'rfind'