SystemCheckError: Проверка системы выявила некоторые проблемы: Django

from mptt.models import MPTTModel, TreeForeignKey

from django.contrib.auth.models import User из django.db import models

class CategoryTask(MPTTModel): """Task Category Model""" title = models.CharField("Title", max_length=200, unique=True) parent = TreeForeignKey( 'self', on_delete=models.CASCADE, null=True, blank=True, related_name='children' ) slug = models.SlugField(max_length=200, unique=True) mastery_need = models.FloatField("Mastery required", default=0) points_need = models.FloatField("Points Required", default=0)

def __str__(self):
    return self.title

class MPTTMeta:
    order_insertion_by = ['title']

class Meta:
    verbose_name = "Категория задания"
    verbose_name_plural = "Категории заданий"

class DCTask(models.Model):

category = models.ForeignKey(CategoryTask, verbose_name="Категория", on_delete=models.CASCADE)
mastery_need = models.FloatField("Требуется мастерства", default=0)
points_need = models.FloatField("Требуется балов", default=0)
mastery = models.FloatField("Получит мастерства", default=0)
points = models.FloatField("Получит балов", default=0)
title = models.CharField("Название", max_length=200)
description = models.TextField("Описание")
slug = models.SlugField(max_length=200, unique=True)
users = models.ManyToManyField(User, verbose_name="Взявшие", blank=True)

def __str__(self):
    return self.title

class Meta:
    verbose_name = "Задание"
    verbose_name_plural = "Задания"

class AnswerDCTask(models.Model): user = models.ForeignKey(User, verbose_name="Пользователь", on_delete=models.CASCADE) задача = models.ForeignKey(DCTask, verbose_name="Задание", on_delete=models.CASCADE) ответ = models.TextField("Ответ") результат = models.BooleanField("Сдано?", default=False) проверка = models.BooleanField("На проверке", по умолчанию=False) verifiers_y = models.ManyToManyField( Пользователь, verbose_name="Проверяюще за", related_name="users_check_y", blank=True ) verifiers_n = models.ManyToManyField( Пользователь, verbose_name="Проверяюще против", related_name="users_check_n", blank=True ) count_check = models.IntegerField("Общее за", default=0) mentor = models.ForeignKey( User, verbose_name="Ментор", on_delete=models.CASCADE, blank=True, null=True, related_name="пользователь_ментор" ) created = models.DateTimeField("Взято", auto_now_add=True) over = models.DateTimeField("Сдано", blank=True, null=True)

def __str__(self):
    return "{} - {}".format(self.user, self.task)

class Meta:
    verbose_name = "Взятое задание"
    verbose_name_plural = "Взятые задания"

class Skills(models.Model): """User Skills""" user = models.ForeignKey(User, verbose_name="User", on_delete=models.CASCADE) skill = models.ForeignKey( CategoryTask, verbose_name="Specialization/Skill", on_delete=models.CASCADE, related_name="skill_user") points = models.FloatField("Points", default=0)

def all_skills(self):
    return Skills.objects.filter(user=self.user)

def __str__(self):
    return "{} - {}".format(self.user, self.skill)

class Meta:
    verbose_name = "Навык пользователя"
    verbose_name_plural = "Навыки пользователя"

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