The 'image' attribute has no file associated with it.

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def upload_location(instance, filename):
    return "%s/%s" % (instance.id, filename)


class Post(models.Model):
    user = models.ForeignKey(User,  blank=True, null=True, on_delete=models.CASCADE, default=1)
    title = models.CharField('Título', max_length=120)
    slug = models.SlugField(unique=True)

    image = models.ImageField('Imagem', upload_to=upload_location,
                              null=True,
                              blank=True,
                              width_field="width_field",
                              height_field="height_field")
    height_field = models.IntegerField(default=0)
    width_field = models.IntegerField(default=0)

    codigo_incorporacao = models.TextField('Código de Incorporação', null=True, blank=True, max_length=240)

    content = models.TextField()
    draft = models.BooleanField(default=False)
    publish = models.DateTimeField('Data', auto_now=False, auto_now_add=False)
    read_time = models.IntegerField(default=0)  # models.TimeField(null=True, blank=True) #assume minutes
    updated = models.DateTimeField(auto_now_add=False, auto_now=True)
    timestamp = models.DateTimeField(auto_now_add=True, auto_now=False)

    objects = PostManager()