Email attachments in Django1.10 failing

Hi Kindly need help to be able attaching a logo and a pdf when emailing, I have been following this great articles 1 and 2  but it seems am always getting something wrong.

Here is a sample code of mine , It fails the following error  "<email.mime.image.MIMEImage instance at 0x7f7156a88d88> is not JSON serializable"

        connection = mail.get_connection()
        msg = EmailMultiAlternatives(

            subject, from_email, receiver)

        msg.attach_alternative(mail_body, 'text/html')

        image = MIMEImage(insurer.company_logo.read())

        image.add_header('Content-ID', '<{}>'.format('logo.png'))

        msg.attach('logo.png',image, 'image/png')

        msg.send()

        connection.send_messages([msg])

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