关于python：在INSTALLED_APPS中添加“pinax.notifications”后，“依赖项引用了不存在的父节点”错误

“dependencies references nonexistent parent node” error after 'pinax.notifications' added in INSTALLED_APPS

在

1	pip install pinax-notifications

之后
并在INSTALLED_APPS中添加了'pinax.notifications'
出现以下错误。

使用python 2.7.9，django 1.7.0。

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Traceback (most recent call last):
File"C:\githome\eventmatch\wsgi\myproject\manage.py", line 11, in
execute_from_command_line(sys.argv)
File"C:\Python27\lib\site-packages\django\core\management\__init__.py", line 385, in execute_from_command_line
utility.execute()
File"C:\Python27\lib\site-packages\django\core\management\__init__.py", line
377, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File"C:\Python27\lib\site-packages\django\core\management\base.py", line 288, in run_from_argv
self.execute(*args, **options.__dict__)
File"C:\Python27\lib\site-packages\django\core\management\base.py", line 338, in execute
output = self.handle(*args, **options)
File"C:\Python27\lib\site-packages\django\core\management\commands\makemigrations.py", line 57, in handle
loader = MigrationLoader(None, ignore_no_migrations=True)
File"C:\Python27\lib\site-packages\django\db\migrations\loader.py", line 48,
in __init__
self.build_graph()
File"C:\Python27\lib\site-packages\django\db\migrations\loader.py", line 241, in build_graph
self.graph.add_dependency(migration, key, parent)
File"C:\Python27\lib\site-packages\django\db\migrations\graph.py", line 42, in add_dependency
raise KeyError("Migration %s dependencies references nonexistent parent node %r" % (migration, parent))
KeyError: u"Migration notifications.0001_initial dependencies references nonexistent parent node (u'contenttypes', u'0002_remove_content_type_name')"