hi all, its my custom module, when trying to run Category view from menu, it is showing error below:

ValueError: Invalid field 'category_name' on model 'pos.category'

same error even when i removed line:  _rec_name = 'category_name'

please help to solve the problem.

category.py

from odoo import api, fields, models

class PosCategory(models.Model):

    _name = "pos.category"

    _rec_name = "category_name"

    _description = "Categories for POS"

    category_name = fields.Char(string='Category Name', required=True)

    group_id = fields.Many2one('pos.group', widget="many2one_tags", string='Related Group')

category.xml

<?xml version="1.0"?>

<odoo>

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

        <field name="name">Category List</field>

        <field name="model">pos.category</field>

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

            <tree>

                <field name="id"/>

                <field name="category_name"/>

                <field name="group_id"/>

            </tree>

        </field>

    </record>

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

        <field name="name">Category Form</field>

        <field name="model">pos.category</field>

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

            <form>

                <sheet>

                    <group name="group_top">

                        <field name="category_name"/>

                        <field name="group_id"/>

                    </group>

                </sheet>

            </form>

        </field>

    </record>    

</odoo>