i was trying to add a field on the view form of hr.department using a custom module so i declared the field in my_model.py

   class my_clas(models.Model):

    _name = 'depart.field' 

    _inherit = "hr.department"

     my_field = fields.Char('My field')

and on the my_file.xml i proceeded this way 

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

                <field name="name">hr.department.form.inherit</field>

                <field name="model">hr.department</field>

                <field name="inherit_id" ref="hr.view_department_form"/>

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

                    <xpath expr="//form/sheet/group/field[@name='name']" position="after">

                       <field name="my_field"/>

                    </xpath>

                </field>

    </record>

Field `namee` does not exist

Error context:
View `hr.department.form.inherit`