title: Django : the database needs something to populate existing row
body: <p>models . py :</p>
  
  <pre><code>    class Equipe(models.Model):
      NomEquipe =  models.CharField(max_length=10,unique=True)
      Description = models.CharField(max_length=10,unique=True)
      class planning (models.Model):
      datedebut= models.DateField
      datefin=models.DateField
      nbrH=models.TimeField    
  
  class Conseiller(models.Model):
      Matricule =  models.CharField(max_length=10,unique=True)
      Nom = models.CharField(max_length=200)
      Prenom = models.CharField(max_length=200)
      Tel = models.CharField(max_length=200)
      Mdp = models.CharField(max_length=200)
      Email = models.EmailField(max_length=200)
      File = models.CharField(max_length=200)
      Preavis = models.BooleanField(default=False)
      sup = models.CharField(max_length=200)
      Equipe =  models.ForeignKey(Equipe, on_delete=models.CASCADE)
      planning = models.ForeignKey(planning , on_delete = models.CASCADE)
  </code></pre>
  
  <p>WHEN I try to execute Manage.py makemigrations  a have the errors and i need to fix this </p>