[Fixed]-Updating template view with error message in django

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Here’s generally the way to fill the errors value:

class DocumentForm(forms.Form):
    labelled_image = forms.FileField(label='Select the Label image')

    def clean_labelled_image(self):
        # ... (your validation code here) ...
        raise forms.ValidationError('Custom error message here')

By putting the validation in the clean_<name> function, you can raise a ValidationError that will be placed in {{form.labelled_image.errors}} once form.is_valid() is run.

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