[Python] I tried to implement custom validation error in django

I have wrote this validators.py file:

from django.core.exceptions import ValidationError
import os

def allow_only_images_validator(value):
ext = os.path.splitext(value.name)[1]
print(ext)
valid_extensions = ['.png', '.jpg', '.jpeg']
if not ext.lower() in valid_extensions:
raise ValidationError("Unsupported file extension. Allowed extensions: " +str(valid_extensions))


This is my forms.py file:

class userProfileForm(forms.ModelForm):
class Meta:

profile_picture = forms.FileField(widget=forms.FileInput(attrs={'class': 'btn btn-info'}), validators=[allow_only_images_validator])
cover_photo = forms.FileField(widget=forms.FileInput(attrs={'class': 'btn btn-info'}), validators=[allow_only_images_validator])


But this error is not showing in my template. The SS is here:

Can anybody help me on how do I fix it?

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