Cfrgtkky

I have this .py code like this

# -*- coding: utf-8 -*-

from odoo import models, fields, api

class Contract_Custom(models.Model):

_inherit = 'hr.contract'



def get_warning(self):

    contact = self.env['hr.contract'].search()

    print(contact)

    i = 0

    while i < len(contact):

        print(type(contact[i].date_end))

        i =i +1

My xml file like this

<?xml version="1.0" encoding="utf-8"?>

<odoo>

   <data>



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

        <field name="name">EPS custom HR form</field>

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

        <field name="inherit_id" ref="hr_contract.hr_contract_view_form"/>

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

             <xpath expr="//sheet" position="before">

                     <header>

                       <button name="get_warning" string="test" type="object" class="oe_highlight"/>

                     </header>

            </xpath>

        </field>

    </record>



</data>

</odoo>

When i install my module for the first time, it run perfectly, but when i fix my code to imporve my function, and update my model, It show me an error like this.

CRITICAL mydatabase_name odoo.service.server: Failed to initialize database `mydatabase_name`.

How can i fix this, I try a lot of ways but nothing change

Thanks in advance