Как правильно работать с моделями в django?

Здравствуйте!

В моем проекте со структурой:


Есть вот такой код в папке userroles/models.py:

from django.db import models
from django.db.models.signals import post_save
from django.contrib.auth.models import User, Group
from distrib_system.choose_distrib.models import Container
    
class UserProfile(models.Model):
    
    user = models.OneToOneField(User)
    containers = models.ManyToManyField(Container)


class StudentManager(models.Manager):

    def get_query_set(self):
        return super(StudentManager, self).get_query_set().filter(student__enrolled=True).distinct()

class Student(Group):
    group = models.CharField(max_length = 10)
    objects = models.Manager()
    has_students = StudentManager()
    
    class Meta:
        verbose_name_plural = "Students"
        ordering = ['name']
        permissions = {}
   
class CooperatorManager(models.Manager):

    def get_query_set(self):
        return super(CooperatorManager, self).get_query_set().filter(cooperator__enrolled=True).distinct()

class Cooperator(Group):
    work = models.CharField(max_length = 100)
    objects = models.Manager()
    has_students = CooperatorManager()
    
    class Meta:
        verbose_name_plural = "Cooperators"
        ordering = ['name']
        permissions = {}
   
class ProfessorManager(models.Manager):

    def get_query_set(self):
        return super(ProfessorManager, self).get_query_set().filter(professor__enrolled=True).distinct()

class Professor(Group):
    education_course = models.CharField(max_length = 100)
    objects = models.Manager()
    has_students = ProfessorManager()
    
    class Meta:
        verbose_name_plural = "Professors"
        ordering = ['name']
        permissions = {}

class ScientificDirectorManager(models.Manager):

    def get_query_set(self):
        return super(ScientificDirectorManager, self).get_query_set().filter(scientificdirector__enrolled=True).distinct()
        
class ScientificDirector(Group):
    education_course = models.CharField(max_length = 100)
    objects = models.Manager()
    has_students = ScientificDirectorManager()
    
    class Meta:
        verbose_name_plural = "Scientific directors"
        ordering = ['name']
        permissions = {}

    
def create_profile(sender, **kwargs):
    
    user = kwargs["instance"]
    if kwargs["created"]:
        user_profile = UserProfile(user=user)
        user_profile.save()
post_save.connect(create_profile, sender=User)

и код в папке choose_distrib/models.py:

from django.db import models
from django.core.validators import MaxValueValidator, MinValueValidator
from distrib_system.userroles.models import UserProfile

# Create your models here.

class Container(models.Model):   
    #лаборатория 
    container_name = models.CharField(max_length = 100, verbose_name = 'Название лаборатории')
    container_director = models.OneToOneField(UserProfile, on_delete= models.CASCADE)
    container_capacity = models.IntegerField(
        default = 0,
        validators=[MaxValueValidator(200), MinValueValidator(0)]
    )
    
    
    def __str__(self):
        return "Название лаборатории: {0}".format(self.lab_name)


class Request(models.Model):
    #Запрос в "контейнер"
    student = models.ForeignKey(UserProfile, on_delete= models.CASCADE)
    container = models.ForeignKey(Container, on_delete= models.CASCADE)
    
    '''
    0 = SENDED
    1 = ACCEPTED
    2 = DECLINED 
    '''
    status = models.IntegerField(default = 0)
    
    send_date = models.DateField(auto_now=True)

Но при создании миграции проходит stacktrace, в котором указано, что таких моделей будто нет:

D:\LiClipse\Projects\Система распределения\distrib_system>python manage.py makemigrations
Traceback (most recent call last):
  File "manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File "D:\Python36\lib\site-packages\django\core\management\__init__.py", line 363, in execute_from_command_line
    utility.execute()
  File "D:\Python36\lib\site-packages\django\core\management\__init__.py", line 337, in execute
    django.setup()
  File "D:\Python36\lib\site-packages\django\__init__.py", line 27, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "D:\Python36\lib\site-packages\django\apps\registry.py", line 108, in populate
    app_config.import_models()
  File "D:\Python36\lib\site-packages\django\apps\config.py", line 202, in import_models
    self.models_module = import_module(models_module_name)
  File "D:\Python36\lib\importlib\__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 978, in _gcd_import
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load
  File "<frozen importlib._bootstrap>", line 950, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 205, in _call_with_frames_removed
  File "D:\LiClipse\Projects\Система распределения\distrib_system\choose_distrib\models.py", line 3, in <module>
    from distrib_system.userroles.models import UserProfile
ModuleNotFoundError: No module named 'distrib_system.userroles'

Как решить эту проблему с импортом?