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我有一个工作项目，我想向其中一个模型添加一个新字段。我添加了新字段并运行了makemigrations命令，然后我得到了ValueError: too many values to unpack

这是模型：

class Line(models.Model):                     
    name = models.CharField(max_length=250, null=False, blank=False, unique=True)
    label_name = models.CharField(max_length=250, null=True, blank=True, unique=True)

我想添加这个字段：

link = models.CharField(max_length=200,null=True,blank=True, unique=True)

然后我运行makemigrations命令，得到了这个异常异常：

Traceback (most recent call last):
  File "C:\Program Files\JetBrains\PyCharm 2017.3.3\helpers\pycharm\django_manage.py", line 52, in <module>
    run_command()
  File "C:\Program Files\JetBrains\PyCharm 2017.3.3\helpers\pycharm\django_manage.py", line 46, in run_command
    run_module(manage_file, None, '__main__', True)
  File "C:\Python27\lib\runpy.py", line 176, in run_module
    fname, loader, pkg_name)
  File "C:\Python27\lib\runpy.py", line 82, in _run_module_code
    mod_name, mod_fname, mod_loader, pkg_name)
  File "C:\Python27\lib\runpy.py", line 72, in _run_code
    exec code in run_globals
  File "F:\cellular_resolution_map_of_larval_zebrafish\manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "C:\Python27\lib\site-packages\django\core\management\__init__.py", line 350, in execute_from_command_line
    utility.execute()
  File "C:\Python27\lib\site-packages\django\core\management\__init__.py", line 342, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Python27\lib\site-packages\django\core\management\base.py", line 348, in run_from_argv
    self.execute(*args, **cmd_options)
  File "C:\Python27\lib\site-packages\django\core\management\base.py", line 399, in execute
    output = self.handle(*args, **options)
  File "C:\Python27\lib\site-packages\django\core\management\commands\makemigrations.py", line 105, in handle
    loader.project_state(),
  File "C:\Python27\lib\site-packages\django\db\migrations\loader.py", line 338, in project_state
    return self.graph.make_state(nodes=nodes, at_end=at_end, real_apps=list(self.unmigrated_apps))
  File "C:\Python27\lib\site-packages\django\db\migrations\graph.py", line 280, in make_state
    project_state = self.nodes[node].mutate_state(project_state, preserve=False)
  File "C:\Python27\lib\site-packages\django\db\migrations\migration.py", line 88, in mutate_state
    operation.state_forwards(self.app_label, new_state)
  File "C:\Python27\lib\site-packages\django\db\migrations\operations\fields.py", line 51, in state_forwards
    state.reload_model(app_label, self.model_name_lower)
  File "C:\Python27\lib\site-packages\django\db\migrations\state.py", line 148, in reload_model
    self.apps.render_multiple(states_to_be_rendered)
  File "C:\Python27\lib\site-packages\django\db\migrations\state.py", line 296, in render_multiple
    model.render(self)
  File "C:\Python27\lib\site-packages\django\db\migrations\state.py", line 585, in render
    body,
  File "C:\Python27\lib\site-packages\django\db\models\base.py", line 158, in __new__
    new_class.add_to_class(obj_name, obj)
  File "C:\Python27\lib\site-packages\django\db\models\base.py", line 299, in add_to_class
    value.contribute_to_class(cls, name)
  File "C:\Python27\lib\site-packages\django\db\models\fields\related.py", line 702, in contribute_to_class
    super(ForeignObject, self).contribute_to_class(cls, name, virtual_only=virtual_only)
  File "C:\Python27\lib\site-packages\django\db\models\fields\related.py", line 308, in contribute_to_class
    lazy_related_operation(resolve_related_class, cls, self.remote_field.model, field=self)
  File "C:\Python27\lib\site-packages\django\db\models\fields\related.py", line 85, in lazy_related_operation
    return apps.lazy_model_operation(partial(function, **kwargs), *model_keys)
  File "C:\Python27\lib\site-packages\django\db\models\fields\related.py", line 83, in <genexpr>
    model_keys = (make_model_tuple(m) for m in models)
  File "C:\Python27\lib\site-packages\django\db\models\utils.py", line 13, in make_model_tuple
    app_label, model_name = model.split(".")
ValueError: too many values to unpack

我该如何解决？

非常感谢。

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