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When I migrate the database, I meet some errors, and errors are following:

Operations to perform:
  Synchronize unmigrated apps: staticfiles, messages
  Apply all migrations: admin, contenttypes, api, auth, sessions
Synchronizing apps without migrations:
  Creating tables...
    Running deferred SQL...
  Installing custom SQL...
Running migrations:
  Rendering model states... DONE
  Applying api.0004_auto_20151119_1545...Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/Library/Python/2.7/site-packages/django/core/management/__init__.py", line 354, in execute_from_command_line
    utility.execute()
  File "/Library/Python/2.7/site-packages/django/core/management/__init__.py", line 346, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Library/Python/2.7/site-packages/django/core/management/base.py", line 394, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/Library/Python/2.7/site-packages/django/core/management/base.py", line 445, in execute
    output = self.handle(*args, **options)
  File "/Library/Python/2.7/site-packages/django/core/management/commands/migrate.py", line 222, in handle
    executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
  File "/Library/Python/2.7/site-packages/django/db/migrations/executor.py", line 110, in migrate
    self.apply_migration(states[migration], migration, fake=fake, fake_initial=fake_initial)
  File "/Library/Python/2.7/site-packages/django/db/migrations/executor.py", line 148, in apply_migration
    state = migration.apply(state, schema_editor)
  File "/Library/Python/2.7/site-packages/django/db/migrations/migration.py", line 115, in apply
    operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
  File "/Library/Python/2.7/site-packages/django/db/migrations/operations/fields.py", line 62, in database_forwards
    field,
  File "/Library/Python/2.7/site-packages/django/db/backends/sqlite3/schema.py", line 179, in add_field
    self._remake_table(model, create_fields=[field])
  File "/Library/Python/2.7/site-packages/django/db/backends/sqlite3/schema.py", line 77, in _remake_table
    self.effective_default(field)
  File "/Library/Python/2.7/site-packages/django/db/backends/base/schema.py", line 211, in effective_default
    default = field.get_db_prep_save(default, self.connection)
  File "/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py", line 710, in get_db_prep_save
    prepared=False)
  File "/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py", line 1322, in get_db_prep_value
    value = self.get_prep_value(value)
  File "/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py", line 1317, in get_prep_value
    return self.to_python(value)
  File "/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py", line 1274, in to_python
    parsed = parse_date(value)
  File "/Library/Python/2.7/site-packages/django/utils/dateparse.py", line 60, in parse_date
    match = date_re.match(value)
TypeError: expected string or buffer

and the source code of models.py is following:

from django.db import models
from django.core.exceptions import ValidationError
from django.utils.dateformat import format
from django.contrib.auth.models import AbstractUser
from datetime import date
import datetime
from django.conf import settings
from django.db.models import Sum
from django.utils import timezone
from django.utils.dateformat import format
# Create your models here.
#Users, Contacts, Events

class User(models.Model):
    phonenum = models.CharField(max_length=20)
    username = models.CharField(max_length=20)
    def get_usr_info(self):
        data = {}  # dictionary
        data['phonenum'] = self.phonenum
        data['name'] = self.username
        return data

class Contacts(models.Model):
    user = models.ForeignKey(User)

class UpdateEvents(models.Model):
    user = models.ForeignKey(User)
    events = models.CharField(max_length=50)
    latitude = models.CharField(max_length=10)
    longitude = models.CharField(max_length=10)
    city = models.CharField(max_length=10)
    arriveDate = models.DateTimeField(blank=True, null=True)
    leaveDate = models.DateTimeField(blank=True, null=True)
    #arriveDate = models.CharField(max_length=15, default="")
    #leaveDate = models.CharField(max_length=15, default="")
    def get_events_info(self):
        data = {}
        data['phonenum'] = self.user.phonenum
        data['name'] = self.user.username
        data['events'] = self.events
        data['latitude'] = self.latitude
        data['longitude'] = self.longitude
        data['city'] = self.city
        data['arriveDate'] = format(self.arriveDate, "U")
        data['leaveDate'] = format(self.leaveDate, "U")
        return data

 

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