i make a new page with tree view and form view

Now I want to make a kanban view for it and i failed

<record id="custom_kanban" model="ir.ui.view">

<field name="name">custom.kanban</field>

<field name="model">custom</field>

<field name="type">kanban</field>

<field name="arch" type="xml">

<kanban>

<field name="name"/>  

<templates>

<t t-name="kanban-box">

<div class="oe_product_vignette">

<a type="open">

<img class="oe_kanban_image"

t-att-src="kanban_image('custom', 'image', record.id.value)" />

</a>

<div class="oe_product_desc">

<h4>

<a type="edit">

<field name="name"></field>

</a>

</h4>

<ul>

<li>Field 1 : </li>

<li>Field 2 : </li>

</ul>

</div>

</div>

</t>

</templates>

</kanban>

</field>

</record>

When I update the module, it says "except_orm: (u'ValidateError', u'The value "kanban" for the field "ir_act_window.view_type" is not in the selection')"