ImportError: cannot import name migrations

[Jorigorn]

(django_blog)[root@localhost django_blog]# python manage.py syncdb
Syncing...
Creating tables ...
Installing custom SQL ...
Installing indexes ...
Installed 0 object(s) from 0 fixture(s)

Synced:

django.contrib.admin
django.contrib.auth
django.contrib.contenttypes
django.contrib.sessions
django.contrib.messages
django.contrib.staticfiles
django.contrib.sitemaps
pagedown
south
compressor
debug_toolbar

Not synced (use migrations):

• reversion
• apps.blog
  (use ./manage.py migrate to migrate these)

(django_blog)[root@localhost django_blog]# python manage.py migrate apps.blog
Traceback (most recent call last):
File "manage.py", line 10, in
execute_from_command_line(sys.argv)
File "/root/.virtualenvs/django_blog/lib/python2.7/site-packages/django/core/management/init.py", line 399, in execute_from_command_line
utility.execute()
File "/root/.virtualenvs/django_blog/lib/python2.7/site-packages/django/core/management/init.py", line 392, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/root/.virtualenvs/django_blog/lib/python2.7/site-packages/django/core/management/base.py", line 242, in run_from_argv
self.execute(_args, *_options.dict)
File "/root/.virtualenvs/django_blog/lib/python2.7/site-packages/django/core/management/base.py", line 285, in execute
output = self.handle(_args, *_options)
File "/root/.virtualenvs/django_blog/lib/python2.7/site-packages/south/management/commands/migrate.py", line 111, in handle
ignore_ghosts = ignore_ghosts,
File "/root/.virtualenvs/django_blog/lib/python2.7/site-packages/south/migration/init.py", line 173, in migrate_app
Migrations.calculate_dependencies()
File "/root/.virtualenvs/django_blog/lib/python2.7/site-packages/south/migration/base.py", line 229, in calculate_dependencies
migration.calculate_dependencies()
File "/root/.virtualenvs/django_blog/lib/python2.7/site-packages/south/migration/base.py", line 363, in calculate_dependencies
for migration in self._get_dependency_objects("depends_on"):
File "/root/.virtualenvs/django_blog/lib/python2.7/site-packages/south/migration/base.py", line 343, in _get_dependency_objects
for app, name in getattr(self.migration_class(), attrname, []):
File "/root/.virtualenvs/django_blog/lib/python2.7/site-packages/south/migration/base.py", line 315, in migration_class
return self.migration().Migration
File "/root/.virtualenvs/django_blog/lib/python2.7/site-packages/south/utils/init.py", line 62, in method
value = function(self)
File "/root/.virtualenvs/django_blog/lib/python2.7/site-packages/south/migration/base.py", line 304, in migration
raise exceptions.UnknownMigration(self, sys.exc_info())
south.exceptions.UnknownMigration: Migration 'reversion:0001_initial' probably doesn't exist.
Traceback (most recent call last):
File "/root/.virtualenvs/django_blog/lib/python2.7/site-packages/south/migration/base.py", line 302, in migration
migration = import(full_name, {}, {}, ['Migration'])
File "/root/.virtualenvs/django_blog/lib/python2.7/site-packages/reversion/migrations/0001_initial.py", line 4, in
from django.db import models, migrations
ImportError: cannot import name migrations

[laoyang103]

Run 'pip list' and check django version is 1.7.4
The follow is my 'pip list' output:
Django (1.7.4)
django-appconf (1.0.1)
django-compressor (1.5)
django-debug-toolbar (1.2.2)
django-pagedown (0.1.0)
django-reversion (1.8.7)
ecdsa (0.13)
Fabric (1.10.1)
Markdown (2.6.2)
paramiko (1.15.2)
pip (7.0.3)
pycrypto (2.6.1)
Pygments (2.0.2)
setuptools (17.0)
six (1.9.0)
sqlparse (0.1.15)
wheel (0.24.0)