MinLengthValidator error min and max value Follow

Newbie - I'm trying to call clean_title_length to error on length title is less than 3 characters or more than 25 characters.

I tried using   MinLengthValidator, but it did not work.

class Video(models.Model):
    title = models.CharField(max_length=255)
    url = models.URLField()
    youtube_id = models.CharField(max_length=255)

    def clean_title_length(self):
        data = self.cleaned_data['title']
        length= len(data)
        if length < 3 or length > 25:
            raise ValidationError("The length of the title must be between 3 and 25 characters")
        else:
            return data

views.py

def add_video(request):
     form = VideoForm()
     if request.method == 'POST':
          filled_form = VideoForm(request.POST)
          if filled_form.is_valid():

Form always come back valid.

Could you give me a snippet that would show error message above the text box saying title between 3 and 25 characters?

TIA.