Askbot installation fails in migration due to 0 values in AutoField

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Hi all, hope you can help with what seems to be a small problem.

I'm trying to install askbot on a new server and have run into problems with the migration chain for target 'askbot' during setup.

Any ideas? I've listed the libraries that pip install askbot installed for me at the end of the post.

[root@orbital askbot-django]# python manage.py migrate askbot
/usr/lib/python2.6/site-packages/django/utils/hashcompat.py:9: DeprecationWarning: django.utils.hashcompat is deprecated; use hashlib instead
  DeprecationWarning)
/usr/lib/python2.6/site-packages/django/core/management/__init__.py:465: DeprecationWarning: The 'execute_manager' function is deprecated, you likely need to update your 'manage.py'; please see the Django 1.4 release notes (https://docs.djangoproject.com/en/dev/releases/1.4/).
  DeprecationWarning)
/usr/lib/python2.6/site-packages/django/core/management/__init__.py:409: DeprecationWarning: The 'setup_environ' function is deprecated, you likely need to update your 'manage.py'; please see the Django 1.4 release notes (https://docs.djangoproject.com/en/dev/releases/1.4/).
  DeprecationWarning)
/usr/lib/python2.6/site-packages/django/conf/urls/defaults.py:3: DeprecationWarning: django.conf.urls.defaults is deprecated; use django.conf.urls instead
  DeprecationWarning)
WARNING!!! You are using a 'locmem' (local memory) caching backend,
which is OK for a low volume site running on a single-process server.
For a multi-process configuration it is neccessary to have a production
cache system, such as redis or memcached.

With local memory caching and multi-process setup you might intermittently
see outdated content on your site.

Running migrations for askbot:
 - Migrating forwards to 0170_auto__add_field_group_read_only.
 > askbot:0055_auto__chg_field_question_thread
 - Migration 'askbot:0055_auto__chg_field_question_thread' is marked for no-dry-run.
 ! Error found during real run of migration! Aborting.

 ! Since you have a database that does not support running
 ! schema-altering statements in transactions, we have had 
 ! to leave it in an interim state between migrations.

! You *might* be able to recover with:   (migration cannot be dry-run; cannot discover commands)
 ! The South developers regret this has happened, and would
 ! like to gently persuade you to consider a slightly
 ! easier-to-deal-with DBMS (one that supports DDL transactions)
 ! NOTE: The error which caused the migration to fail is further up.
Error in migration: askbot:0055_auto__chg_field_question_thread
ValueError: The database backend does not accept 0 as a value for AutoField.

Here are the libraries according to pip list:

AddOns (0.6)
akismet (0.2.0)
amqp (1.0.13)
anyjson (0.3.3)
askbot (0.7.49)
Babel (0.9.4)
Beaker (1.3.1)
beautifulsoup4 (4.3.2)
billiard (2.7.3.34)
BytecodeAssembler (0.5.1)
cas (0.15)
celery (3.0.24)
chardet (2.1.1)
Cheetah (2.4.1)
Coffin (0.3.8)
decorator (3.0.1)
DecoratorTools (1.7)
distribute (0.6.10)
Django (1.5)
django-appconf (0.6)
django-celery (3.0.11)
django-compressor (1.2)
django-countries (1.0.5)
django-followit (0.0.3)
django-keyedcache (1.4-6)
django-kombu (0.9.4)
django-picklefield (0.3.0)
django-recaptcha-works (0.3.4)
django-robots (0.9.2)
django-threaded-multihost (1.4-1)
django-tinymce (1.5.1b2)
ethtool (0 ...