I keep getting the error "The user cannot have more than one user types" on my server.  I first ran across it trying to test out multi-site on my staging server, I also ran across it while testing an upgrade to the database and if I "Update all modules" from the Odoo Editor.

This is the closest to an error message I seem to get:

  File "/home/odoo/src/odoo/odoo/addons/base/models/res_users.py", line 405, in _check_one_user_type
    raise ValidationError(_('The user cannot have more than one user types.'))
odoo.tools.convert.ParseError: "The user cannot have more than one user types.
None" while parsing /home/odoo/src/odoo/odoo/addons/base/security/base_groups.xml:14, near
<record model="res.groups" id="group_system">            
            <field name="name">Settings</field>
            <field name="implied_ids" eval="[(4, ref('group_erp_manager'))]"/>
            <field name="users" eval="[(4, ref('base.user_root')), (4, ref('base.user_admin'))]"/>
        </record>

I admit I don't know much about users or security or why this error is coming about.  Any help would be appreciated debugging it.

Odoo version 12.