Django 不是一个可调用的问题

遇到下面的错误，不太确定是什么问题。在运行 python manage.py migrate 之前我没有注意到模式中缺少电话字段。现在，当我尝试运行服务器时，出现以下错误。我确实对模态进行了更改（添加了电话字段）并尝试运行 python manage.py migrate。我以为它会重新迁移，但没有运气。得到与下面相同的错误。

    contacts - models.py: 

    from django.db import models
    from datetime import datetime

    # Create your models here.
    class Contact(models.Model):
        listing  =  models.CharField(max_length=200)
        listing_id = models.IntegerField()
        name = models.CharField(max_length=200)
        email = models.CharField(max_length=200)
        phone = models.CharField(max_length=200)
        message = models.TextField(blank=True)
        contact_date = models.DateField(default = datetime.now, blank = True)
        user_id = models.IntegerField(blank=True)
        def __str__(self):
            return self.name

contacts - admin.py - 

from django.contrib import admin

# Register your models here.
from .models import Contact



class ContactAdmin(admin.ModelAdmin):
    list_display =('id', 'name', 'listing', 'email' 'contact_date')
    list_diplay_links=('id','name')
    search_fields = ('name', 'email', 'listing')
    list_per_page=25

admin.site.register(Contact, ContactAdmin)


Error logs: 

(venv) User-MBP:btre_project user$ python manage.py runserver
Performing system checks...

Unhandled exception in thread started by <function check_errors.<locals>.wrapperat 0x110c651e0>
Traceback (most recent call last):
  File "/Users/rizwanrenesa/Desktop/btre_project/venv/lib/python3.7/site-packages/django/utils/autoreload.py", line 225, in wrapper
    fn(*args, **kwargs)
  File "/Users/rizwanrenesa/Desktop/btre_project/venv/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 117, in inner_run
    self.check(display_num_errors=True)
  File "/Users/rizwanrenesa/Desktop/btre_project/venv/lib/python3.7/site-packages/django/core/management/base.py", line 425, in check
    raise SystemCheckError(msg)
django.core.management.base.SystemCheckError: SystemCheckError: System check identified some issues:

ERRORS:
<class 'contacts.admin.ContactAdmin'>: (admin.E108) The value of 'list_display[3]' refers to 'emailcontact_date', which is not a callable, an attribute of 'ContactAdmin', or an attribute or method on 'contacts.Contact'.