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As I found here https://code.djangoproject.com/ticket/25280#no1
A quick fix is to workaround this issue is just copy paste the code in django.core.validators:
from django.core.validators import RegexValidator
url_regex_validator = [RegexValidator(
regex=r'^(\w{1,5}:\/\/)([\w\+\/-]+)([\.]\w{1,4})$',
message="Error invalid URL")]
class MyModel(models.Model):
slug = models.SlugField(unique=True, validators=url_regex_validator)
Source:stackexchange.com