[Python] adding chatter on res.users

I'm curious how to add chatter to res.users in Odoo14.I keep trying but keep getting error.

from odoo import models, fields, api

class ResUsers(models.Model):
_inherit = ["res.users", "mail.thread", "mail.activity.mixin"]

<?xml version="1.0" encoding="UTF-8"?>
<odoo>
<data>
<record id="view_users_form_inherit_chatter" model="ir.ui.view">
<field name="name">res.users.form.inherit.chatter</field>
<field name="model">res.users</field>
<field name="inherit_id" ref="base.view_users_form"/>
<field name="arch" type="xml">
<xpath expr="//form/sheet" position="after">
<div class="oe_chatter">
<field name="message_follower_ids" widget="mail_followers"/>
<field name="activity_ids" widget="mail_activity"/>
<field name="message_ids" widget="mail_thread"/>
</div>
</xpath>
</field>
</record>
</data>
</odoo>


What's wrong with this code and is anyone ever succesed adding chatter to res.users? Thanks

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