Error when creating a course sequence

(InteractiveConsole)
>>> from sequence import models
>>> from datetime import datetime
>>> start = datetime(2014, 3, 13)
>>> finish = datetime(2014, 4, 13)
>>> models.create_sequence(start, finish)
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/app/sequence/models.py", line 36, in create_sequence
    sequence_db.save()
  File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/base.py", line 545, in save
    force_update=force_update, update_fields=update_fields)
  File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/base.py", line 573, in save_base
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
  File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/base.py", line 654, in _save_table
    result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
  File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/base.py", line 687, in _do_insert
    using=using, raw=raw)
  File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/manager.py", line 232, in _insert
    return insert_query(self.model, objs, fields, **kwargs)
  File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/query.py", line 1511, in insert_query
    return query.get_compiler(using=using).execute_sql(return_id)
  File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 899, in execute_sql
    cursor.execute(sql, params)
  File "/app/.heroku/python/lib/python2.7/site-packages/django/db/backends/util.py", line 53, in execute
    return self.cursor.execute(sql, params)
  File "/app/.heroku/python/lib/python2.7/site-packages/django/db/utils.py", line 99, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/app/.heroku/python/lib/python2.7/site-packages/django/db/backends/util.py", line 53, in execute
    return self.cursor.execute(sql, params)
ProgrammingError: relation "sequence_sequence" does not exist
LINE 1: INSERT INTO "sequence_sequence" ("signup_close_date", "start...