Django模型类app.models.tasks不声明显式app_标签，也不在已安装的app_应用程序中的应用程序中

我的Django站点有这个视图和模型设置

当我运行我的页面，我得到下面的错误，我不知道为什么

如果有人能推荐我能做些什么来解决这个问题，我将非常感激

有人能帮忙吗

'Model class app.models.tasks doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.

这是密码

from __future__ import unicode_literals
from django.shortcuts import render, redirect
from django.http import HttpResponse
from django.contrib.auth import authenticate, login, logout
from django.contrib import messages
from django.http import *
from django.shortcuts import render_to_response,redirect
from django.template import RequestContext
from django.contrib.auth.decorators import login_required
from django.contrib.auth import authenticate, login, logout
from django.contrib.auth.models import User
from django.contrib.auth.forms import UserChangeForm
from django.db.models import Q
from django.db.models import Count
from datetime import datetime
from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth import update_session_auth_hash
from django.contrib.auth.forms import PasswordChangeForm
from datetime import date
from .models import tasks

def create_task(request):
    if request.method == 'POST':
        creator = request.user
        job_title = request.POST.get('job_title')
        skill_name = request.POST.get('skill_name')
        starting = request.POST.get('starting')
        description = request.POST.get('description')
        target_date = request.POST.get('target_date')
    i = tasks.objects.create(creator=creator, job_title=job_title, skill_name=skill_name,  starting=starting, current=starting, description=description, target_date=target_date)
    messages.success(request, ('Skill created'))
    return redirect('index')

我有这个模型：

from django.db import models

class tasks(models.Model):
    job_title = models.CharField(max_length=400, default="none")
    creator = models.CharField(max_length=400, default="none")
    skill_name = models.CharField(max_length=400)
    starting = models.CharField(max_length=400, default="none")
    current = models.CharField(max_length=400, default="none")
    description = models.CharField(max_length=4000000, default="none")
    target_date = models.CharField(max_length=400, default="none")
    def __str__(self):
        return self.text

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根据上面的评论，当配置了一个新的应用程序，但不是设置中已安装的应用程序的一部分时，就会发生此错误。py

您是否使用settings.py中的应用程序名称更新了已安装的应用程序？我真是愚蠢到令人难以置信。非常感谢。别担心！这发生在我们所有人身上：