Problem installing fixture '.../src/maasserver/fixtures/dev_fixture.yaml

[Gavin Panella]

$ make sampledata
...
bin/database --preserve run -- bin/maas-region-admin loaddata \
  src/maasserver/fixtures/dev_fixture.yaml
Traceback (most recent call last):
  File "bin/maas-region-admin", line 45, in <module>
    maasserver.execute_from_command_line()
  File ".../src/maasserver/__init__.py", line 44, in
  execute_from_command_line
    django.core.management.execute_from_command_line()
  File ".../django/core/management/__init__.py", line 399, in
  execute_from_command_line
    utility.execute()
  File ".../django/core/management/__init__.py", line 392, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File ".../django/core/management/base.py", line 242, in run_from_argv
    self.execute(*args, **options.__dict__)
  File ".../django/core/management/base.py", line 285, in execute
    output = self.handle(*args, **options)
  File ".../django/core/management/commands/loaddata.py", line 55, in
  handle
    self.loaddata(fixture_labels)
  File ".../django/core/management/commands/loaddata.py", line 84, in
  loaddata
    self.load_label(fixture_label)
  File ".../django/core/management/commands/loaddata.py", line 134, in
  load_label
    for obj in objects:
  File ".../django/core/serializers/pyyaml.py", line 75, in Deserializer
    six.reraise(DeserializationError, DeserializationError(e),
    sys.exc_info()[2])
  File ".../django/core/serializers/pyyaml.py", line 69, in Deserializer
    for obj in PythonDeserializer(yaml.load(stream, Loader=SafeLoader),
    **options):
  File ".../django/core/serializers/python.py", line 90, in Deserializer
    Model = _get_model(d["model"])
  File ".../django/core/serializers/python.py", line 153, in _get_model
    raise base.DeserializationError("Invalid model identifier: '%s'" %
    model_identifier)
django.core.serializers.base.DeserializationError: Problem installing
fixture '.../src/maasserver/fixtures/dev_fixture.yaml': Invalid model
identifier: 'maasserver.macstaticipaddresslink'