Problems with migrations cleaning up a date field

I'm having problems with a migration after cleaning up an oddity with a date field and I'm not sure how to fix it.  Any advice appreciated.

I made this change to a date field:

-    start_date = models.DateField(db_index=True, default=False,
-                                  help_text="The date enrollment can begin this Season.")
+    start_date = models.DateField(db_index=True, help_text="The date enrollment can begin this Season.")

I'm not sure how a default of False ever made it, but I ran across it and fixed it.

This is the migration that was created:

class Migration(migrations.Migration):

    dependencies = [
        ('district', '0012_auto_20160622_1741'),
    ]

    operations = [
        migrations.AlterField(
            model_name='season',
            name='start_date',
            field=models.DateField(help_text=b'The date enrollment can begin this Season.', db_index=True),
        ),
    ]

This is the error I get trying to run the migration:

  Applying district.0013_auto_20170204_1811...Traceback (most recent call last):

  File "manage.py", line 9, in <module>

    execute_from_command_line(sys.argv)

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/core/management/__init__.py", line 354, in execute_from_command_line

    utility.execute()

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/core/management/__init__.py", line 346, in execute

    self.fetch_command(subcommand).run_from_argv(self.argv)

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/core/management/base.py", line 394, in run_from_argv

    self.execute(*args, **cmd_options)

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/core/management/base.py", line 445, in execute

    output = self.handle(*args, **options)

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 222, in handle

    executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/db/migrations/executor.py", line 110, in migrate

    self.apply_migration(states[migration], migration, fake=fake, fake_initial=fake_initial)

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/db/migrations/executor.py", line 148, in apply_migration

    state = migration.apply(state, schema_editor)

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/db/migrations/migration.py", line 115, in apply

    operation.database_forwards(self.app_label, schema_editor, old_state, project_state)

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/db/migrations/operations/fields.py", line 201, in database_forwards

    schema_editor.alter_field(from_model, from_field, to_field)

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/db/backends/base/schema.py", line 484, in alter_field

    old_db_params, new_db_params, strict)

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/db/backends/base/schema.py", line 566, in _alter_field

    old_default = self.effective_default(old_field)

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/db/backends/base/schema.py", line 211, in effective_default

    default = field.get_db_prep_save(default, self.connection)

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 710, in get_db_prep_save

    prepared=False)

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 1322, in get_db_prep_value

    value = self.get_prep_value(value)

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 1317, in get_prep_value

    return self.to_python(value)

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 1274, in to_python

    parsed = parse_date(value)

  File "/Users/leehinde/Documents/Clients/rnrvirtual/venv-python2.7-django/lib/python2.7/site-packages/django/utils/dateparse.py", line 60, in parse_date

    match = date_re.match(value)

TypeError: expected string or buffer

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