Hi, I want to add tree and some fields inside of page. For example like this :

For example, I write code like this :

     <xpath expr="//page[1]" position="after">

         <page string="Pendapatan Karyawan">

             <tree string="Tunjangan Gaji">

                 <field name="gaji_pokok"/>

             </tree>

     </page>

</xpath>

Then, I have error message like this :

 Model 'hr.payslip' does not exist in registry.

Can anyone help me?