What relationships?

Question

Django

Hello. Made a model for adding pdf files. I made categories but when adding a file and selecting a category, it gives an error:
The above exception (ERROR: relation "portal_category" does not exist LINE 1: INSERT INTO "portal_category" ("ca2") VALUES ('Positions') R... ^ ) was the direct cause of the following exception:
migrate and makemigrations doesn't help

<code>class Category(models.Model):
  ca2 = models.CharField(max_length=50, verbose_name='Название категории')

  class Meta():
    verbose_name = 'Категория'
    verbose_name_plural = 'Категории'

  def __str__(self):
    return self.name


class Pdf(models.Model):
  title = models.CharField(max_length=100)
  file = models.FileField(upload_to='files')
  #date_pub_f = models.DateTimeField(blank=True, null=True)

  ca1 = models.ForeignKey(Category, verbose_name='Категория', on_delete = models.CASCADE)
  
  
  def __str__(self):
    return self.title</code>