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In the installation process, when i run

python manage.py migrate askbot

i get this error

- Migrating forwards to 0111_populate__thread__added_at.
> askbot:0106_update_postgres_full_text_setup
Traceback (most recent call last):
  File "manage.py", line 11, in <module>
    execute_manager(settings)
  File "/usr/lib/python2.7/site-packages/Django-1.3.1-py2.7.egg/django/core/management/__init__.py", line 438, in execute_manager
    utility.execute()
  File "/usr/lib/python2.7/site-packages/Django-1.3.1-py2.7.egg/django/core/management/__init__.py", line 379, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/lib/python2.7/site-packages/Django-1.3.1-py2.7.egg/django/core/management/base.py", line 191, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/usr/lib/python2.7/site-packages/Django-1.3.1-py2.7.egg/django/core/management/base.py", line 220, in execute
    output = self.handle(*args, **options)
  File "/usr/lib/python2.7/site-packages/South-0.7.3-py2.7.egg/south/management/commands/migrate.py", line 105, in handle
    ignore_ghosts = ignore_ghosts,
  File "/usr/lib/python2.7/site-packages/South-0.7.3-py2.7.egg/south/migration/__init__.py", line 191, in migrate_app
    success = migrator.migrate_many(target, workplan, database)
  File "/usr/lib/python2.7/site-packages/South-0.7.3-py2.7.egg/south/migration/migrators.py", line 221, in migrate_many
    result = migrator.__class__.migrate_many(migrator, target, migrations, database)
  File "/usr/lib/python2.7/site-packages/South-0.7.3-py2.7.egg/south/migration/migrators.py", line 292, in migrate_many
    result = self.migrate(migration, database)
  File "/usr/lib/python2.7/site-packages/South-0.7.3-py2.7.egg/south/migration/migrators.py", line 125, in migrate
    result = self.run(migration)
  File "/usr/lib/python2.7/site-packages/South-0.7.3-py2.7.egg/south/migration/migrators.py", line 99, in run
    return self.run_migration(migration)
  File "/usr/lib/python2.7/site-packages/South-0.7.3-py2.7.egg/south/migration/migrators.py", line 81, in run_migration
    migration_function()
  File "/usr/lib/python2.7/site-packages/South-0.7.3-py2.7.egg/south/migration/migrators.py", line 57, in <lambda>
    return (lambda: direction(orm))
  File "/home/relax/Temp/askmath/askbot/migrations/0106_update_postgres_full_text_setup.py", line 26, in forwards
    setup_full_text_search(script_path)
  File "/home/relax/Temp/askmath/askbot/search/postgresql/__init__.py", line 19, in setup_full_text_search
    cursor.execute(fts_init_query)
  File "/usr/lib/python2.7/site-packages/Django-1.3.1-py2.7.egg/django/db/backends/util.py", line 34, in execute
    return self.cursor.execute(sql, params)
  File "/usr/lib/python2.7/site-packages/Django-1.3.1-py2.7.egg/django/db/backends/postgresql_psycopg2/base.py", line 44, in execute
    return self.cursor.execute(query, args)
django.db.utils.DatabaseError: cannot change name of input parameter "question_id"
HINT:  Use DROP FUNCTION first.

My postgresql version is 9.1.3 and my django version is 1.3.1. Thanks in advance.