Hello,

I have created a simple form. i create a tree view, but when i open tree view, it will report error that "cannot read property of undefined"?

here is my code

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <record id="student_parent_view_form" model="ir.ui.view">
        <field name="name">student.parent.view.form</field>
        <field name="model">student.parent</field>
        <field name="arch" type="xml">
            <form string="Parent">
                <sheet>
                    <field name="image" widget="image" class="oe_avatar" options="{&quot;size&quot;: [90, 90]}"/>
                    <div class="oe_title">
                        <h1>
                            <field name="name" default_focus="1" placeholder="Name"/>
                        </h1>
                    </div>
                    <br/>
                    <div class="oe_left">
                        <label for="relation">Relation</label>
                        <br/>
                        <field name="relation" required="1"/>
                        <br/>
                        <field name="relation_guard" placeholder="Relationship"
                               attrs="{'invisible': [('relation', '!=', 'guardian')], 'required': [('relation', '=', 'guardian')]}"/>
                    </div>
                    <group colspan="4">
                        <group string="Contact Information" name="communication" col="4" colspan="4">
                            <field name="gender"
                                   attrs="{'readonly': [('relation', '!=', 'guardian')]}" force_save="1"/>
                            <field widget="mask" data-inputmask="'mask': '99999-9999999-9'" name="cnic_no"/>
                            <field name="email" widget="email" required="1"/>
                            <field name="occupation"/>
                            <field name="mobile" widget="phone"/>
                            <field name="phone" widget="phone"/>
                            <field name="title" options="{&quot;no_open&quot;: True}"/>
                            <field name="lang"/>
                            <field name="user_ids" invisible="1"/>
                            <field name="spouse_id"/>
                        </group>
                        <group string="Postal Address" name="postal_address">
                            <label for="street" string="Address"/>
                            <div class="o_address_format">
                                <field name="street" placeholder="Street..." class="o_address_street"/>
                                <field name="street2" placeholder="Street 2..." class="o_address_street"/>
                                <field name="city_id" placeholder="City" class="o_address_city"/>
                                <field name="town_id" class="o_address_state" placeholder="Town"
                                       options="{&quot;no_open&quot;: True}"
                                       context="{'country_id': country_id, 'zip': zip}"/>
                                <field name="zip" placeholder="ZIP" class="o_address_zip"/>
                                <field name="country_id" placeholder="Country" class="o_address_country"
                                       options="{&quot;no_open&quot;: True, &quot;no_create&quot;: True}"/>
                            </div>
                            <field name="is_employee" readonly="1" force_save="1"/>
                            <field name="employment_type" readonly="1" force_save="1"/>
                        </group>
                    </group>
                </sheet>
            </form>
        </field>
    </record>

    <record model="ir.ui.view" id="student_parent_view_tree">
        <field name="name">student.parent.view.list</field>
        <field name="model">student.parent</field>
        <field name="arch" type="xml">
            <tree editable="top" string="Parent">
                <field name="name"/>
            </tree>
        </field>
    </record>

    <record model="ir.actions.act_window" id="student_parent_view_list">
        <field name="name">student.parent.view.list</field>
        <field name="res_model">student.parent</field>
        <field name="view_type">form</field>
        <field name="view_mode">tree,form</field>
    </record>
</odoo>