my code in xml

<div id="assignment_line_communication" class="mt8">
    <h2>Communication</h2>
    <t t-call="portal.message_thread">
        <t t-set="object" t-value="assignment_ids"/>
        <t t-set="messages"
           t-value="object.sudo().website_message_ids.filtered(lambda m: m.subtype_id.internal == False)"/>
        <t t-set="pid" t-value="pid"/>
        <t t-set="hash" t-value="hash"/>
    </t>
</div>

when i click send button i am getting 403 error...please help me somebody i am not able to trouble shoot this sproblem.