django.core.exceptions.FieldError: Unknown field(s) (body ) specified for Comment

You need to remove a white space at the end of 'body ' field, where you should have 'body' like below:

class CommentForm(forms.ModelForm):
    class Meta:
        model = Comment
        fields = ('name', 'email', 'body')

The same error also occurs if a model field with editable=False is included in a form's fields. Removing the editable attribute on the model field fixes the error.