Django Form field validation error?

I created a form with the farbtastic color picker widget field.

After submitting the form, form field should validate that the color entered is a
valid 6-character hex encoding of a color.
But it not works.
How can I Fix this,

My code url is
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Your form code is invalid, you should not modify the is_valid() method of the form. Form validation should be done in the clean() method and clean_fieldname methods. Please check out the documentation on Django form validation:

In you example it should be something like this:
class ColorSelection(forms.Form):
  color = forms.CharField(max_length=100, widget=ColorPickerWidget)
  def clean_color(self):
    color = self.cleaned_data['color']
    if not color:
      raise forms.ValidationError("Please enter the color name!")

    if not
      raise forms.ValidationError("Invalid color name!")
    return color

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