Ошибка Django: OperationalError: no such column: posts_post.group_id

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    '''
    from django.db import models
    from django.contrib.auth import get_user_model

    User = get_user_model()


    class Group(models.Model):
        title = models.CharField(max_length=50)
        slug = models.SlugField(unique=True)
        description = models.TextField(max_length=200)

         def __str__(self):
             return self.title


    class Post(models.Model):
        text = models.TextField()
        pub_date = models.DateTimeField(auto_now_add=True)
        author = models.ForeignKey(
            User,
            on_delete=models.CASCADE,
            related_name='posts'
        )
        group = models.ForeignKey(
            Group,
            on_delete=models.CASCADE,
            related_name='posts',
            blank=True,
            null=True,
        )
    '''
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