Django. How to set custom error text for a form field?

Question

Django

class Url(models.Model):
    full = models.URLField(max_length=300, verbose_name='Полный URL',
                           error_messages={'invalid': 'Введите корректный адрес'},
                           validators=[validators.URLValidator(message='Введите корректный адрес', 
                                                                                    code='invalid')])

In this model, I cannot specify the correct error text if I specify an invalid URL.
The standard message is constantly displayed.
In the full field , I specified the error_messages and validators parameters in different ways, with and without them - the error is the same.
In the form itself, I do not set any checks, I just display the form and that's it.