AttributeError:'TaggableManager' object has no attribute 'primary_key'

Hello everyone. i just added "tags = TaggableManager" in my models.py file. So when i initiated to run python manage.py schemamigration myapp --initial it shows below error. I search a lot to solve this but can't. can anyone please help me out of this problem.

File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 399, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 392, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 242, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 285, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python2.7/dist-packages/South-0.8.1-py2.7.egg/south/management/commands/schemamigration.py", line 151, in handle
    for action_name, params in change_source.get_changes():
  File "/usr/local/lib/python2.7/dist-packages/South-0.8.1-py2.7.egg/south/creator/changes.py", line 460, in get_changes
    model_defs = freeze_apps([self.migrations.app_label()])
  File "/usr/local/lib/python2.7/dist-packages/South-0.8.1-py2.7.egg/south/creator/freezer.py", line 32, in freeze_apps
    frozen_models.update(model_dependencies(model))
  File "/usr/local/lib/python2.7/dist-packages/South-0.8.1-py2.7.egg/south/creator/freezer.py", line 96, in model_dependencies
    depends.update(field_dependencies(field, checked_models))
  File "/usr/local/lib/python2.7/dist-packages/South-0.8.1-py2.7.egg/south/creator/freezer.py", line 132, in field_dependencies
    value = get_attribute(field, attrname)
  File "/usr/local/lib/python2.7/dist-packages/South-0.8.1-py2.7.egg/south/utils/__init__.py", line 38, in get_attribute
    value = getattr(value, part)
AttributeError: 'TaggableManager' object has no attribute 'primary_key'

And in south migration tutorials when adding taggit we should add below lines.

from south.modelsinspector import add_ignored_fields  add_ignored_fields(["^taggit\.managers"])

i added those lines. But the same error coming again. 

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