Hello Guys;

Can anyone help me know why do i get this error when i try to inherit a view to be able to add a button under a tree.

Here is my code:

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

<field name="name">test.cnss.form.inherit</field>

<field name="model">test.cnss</field>

<field name="inherit_id" ref="test_cnss.test_cnss_form"/>

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

<data>

<xpath

expr="//field[@name='test_cnss_period_ids']/tree/field[@name='state']"

position="after">

<button name="generate_cnss_txt" type="object" string="Generate CNSS"/>

</xpath>

</data>

</field>

</record>

Then i got this error:

-> return getattr(request.registry.get(model), method)(request.cr, request.uid, *args, **kwargs)

Help please..

Best Regards.