every time i inherit a model now and try to add a fields it doesn't add the new fields

Odoo Server Error

Traceback (most recent call last):
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\models.py", line 1102, in _validate_fields
    check(self)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\addons\base\models\ir_ui_view.py", line 351, in _check_xml
    self.postprocess_and_fields(view.model, view_doc, view.id)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\addons\base\models\ir_ui_view.py", line 1092, in postprocess_and_fields
    self.raise_view_error(message, view_id)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\addons\base\models\ir_ui_view.py", line 545, in raise_view_error
    raise ValueError(message)
ValueError: Field `fax_number` does not exist

Error context:
View `res.partner.inherit`
[view_id: 340, xml_id: n/a, model: res.partner, parent_id: 113]

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\tools\convert.py", line 757, in parse
    self._tags[rec.tag](rec, de, mode=mode)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\tools\convert.py", line 662, in _tag_record
    record = model.with_context(rec_context)._load_records([data], self.mode == 'update')
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\models.py", line 3805, in _load_records
    records = self.create([data['values'] for data in to_create])
  File "<decorator-gen-32>", line 2, in create
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\api.py", line 452, in _model_create_multi
    return create(self, arg)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\addons\base\models\ir_ui_view.py", line 425, in create
    return super(View, self).create(vals_list)
  File "<decorator-gen-3>", line 2, in create
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\api.py", line 452, in _model_create_multi
    return create(self, arg)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\models.py", line 3542, in create
    fields[0].determine_inverse(batch_recs)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\fields.py", line 1104, in determine_inverse
    getattr(records, self.inverse)()
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\addons\base\models\ir_ui_view.py", line 275, in _inverse_arch
    view.write(data)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\addons\base\models\ir_ui_view.py", line 441, in write
    return super(View, self).write(self._compute_defaults(vals))
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\models.py", line 3259, in write
    self._write(store_vals)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\models.py", line 3403, in _write
    self._validate_fields(vals)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\models.py", line 1106, in _validate_fields
    raise ValidationError("%s\n\n%s" % (_("Error while validating constraint"), tools.ustr(e)))
odoo.exceptions.ValidationError: ('Error while validating constraint\n\nField `fax_number` does not exist\n\nError context:\nView `res.partner.inherit`\n[view_id: 340, xml_id: n/a, model: res.partner, parent_id: 113]', None)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\http.py", line 654, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\http.py", line 312, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\tools\pycompat.py", line 87, in reraise
    raise value
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\http.py", line 696, in dispatch
    result = self._call_function(**self.params)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\http.py", line 344, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\service\model.py", line 97, in wrapper
    return f(dbname, *args, **kwargs)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\http.py", line 337, in checked_call
    result = self.endpoint(*a, **kw)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\http.py", line 939, in __call__
    return self.method(*args, **kw)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\http.py", line 517, in response_wrap
    response = f(*args, **kw)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\addons\web\controllers\main.py", line 966, in call_button
    action = self._call_kw(model, method, args, {})
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\addons\web\controllers\main.py", line 954, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\api.py", line 749, in call_kw
    return _call_kw_multi(method, model, args, kwargs)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\api.py", line 736, in _call_kw_multi
    result = method(recs, *args, **kwargs)
  File "<decorator-gen-67>", line 2, in button_immediate_upgrade
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\addons\base\models\ir_module.py", line 71, in check_and_log
    return method(self, *args, **kwargs)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\addons\base\models\ir_module.py", line 596, in button_immediate_upgrade
    return self._button_immediate_function(type(self).button_upgrade)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\addons\base\models\ir_module.py", line 535, in _button_immediate_function
    modules.registry.Registry.new(self._cr.dbname, update_module=True)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\modules\registry.py", line 86, in new
    odoo.modules.load_modules(registry._db, force_demo, status, update_module)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\modules\loading.py", line 417, in load_modules
    force, status, report, loaded_modules, update_module, models_to_check)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\modules\loading.py", line 313, in load_marked_modules
    perform_checks=perform_checks, models_to_check=models_to_check
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\modules\loading.py", line 222, in load_module_graph
    load_data(cr, idref, mode, kind='data', package=package, report=report)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\modules\loading.py", line 68, in load_data
    tools.convert_file(cr, package.name, filename, idref, mode, noupdate, kind, report)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\tools\convert.py", line 801, in convert_file
    convert_xml_import(cr, module, fp, idref, mode, noupdate, report)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\tools\convert.py", line 864, in convert_xml_import
    obj.parse(doc.getroot(), mode=mode)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\tools\convert.py", line 763, in parse
    exc_info[2]
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\tools\pycompat.py", line 86, in reraise
    raise value.with_traceback(tb)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\tools\convert.py", line 757, in parse
    self._tags[rec.tag](rec, de, mode=mode)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\tools\convert.py", line 662, in _tag_record
    record = model.with_context(rec_context)._load_records([data], self.mode == 'update')
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\models.py", line 3805, in _load_records
    records = self.create([data['values'] for data in to_create])
  File "<decorator-gen-32>", line 2, in create
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\api.py", line 452, in _model_create_multi
    return create(self, arg)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\addons\base\models\ir_ui_view.py", line 425, in create
    return super(View, self).create(vals_list)
  File "<decorator-gen-3>", line 2, in create
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\api.py", line 452, in _model_create_multi
    return create(self, arg)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\models.py", line 3542, in create
    fields[0].determine_inverse(batch_recs)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\fields.py", line 1104, in determine_inverse
    getattr(records, self.inverse)()
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\addons\base\models\ir_ui_view.py", line 275, in _inverse_arch
    view.write(data)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\addons\base\models\ir_ui_view.py", line 441, in write
    return super(View, self).write(self._compute_defaults(vals))
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\models.py", line 3259, in write
    self._write(store_vals)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\models.py", line 3403, in _write
    self._validate_fields(vals)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\models.py", line 1106, in _validate_fields
    raise ValidationError("%s\n\n%s" % (_("Error while validating constraint"), tools.ustr(e)))
odoo.tools.convert.ParseError: "Error while validating constraint

Field `fax_number` does not exist

Error context:
View `res.partner.inherit`
[view_id: 340, xml_id: n/a, model: res.partner, parent_id: 113]
None" while parsing file:/c:/program files (x86)/odoo 12.0/server/odoo/addons/res_partner_inherit/views/res_partner_inherit.xml:3, near
<record id="res_partner_inherit" model="ir.ui.view">
    <field name="name">res.partner.inherit</field>
    <field name="model">res.partner</field>
    <field name="inherit_id" ref="base.view_partner_form"/>
    <field name="arch" type="xml">
        <data><xpath expr="//field[@name='zip']" position="attributes">
            <attribute name="placeholder">Postal code</attribute>
            <attribute name="string">Postal_code</attribute>
        </xpath>
        <xpath expr="//field[@name='state_id']" position="attributes">
            <attribute name="placeholder">Province</attribute>
            <attribute name="string">Province</attribute>
        </xpath>
          <xpath expr="//field[@name='mobile']/.." position="after">
            <label for="fax_number"/>
            <div>
                <field name="fax_number"/>
            </div>
        </xpath>
    </data></field>
</record>

my code example

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

from odoo import models, fields, api


class partner(models.Model):
    _inherit = 'res.partner'
    Fax_number = fields.Char(required=False, string="Fax")
    Modify_date = fields.datetime(required=True,string="Date Modified")
    Postal_code = fields.Char(Required=False,string="Postal Code")


<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <record id="res_partner_inherit" model="ir.ui.view">
    <field name="name">res.partner.inherit</field>
    <field name="model">res.partner</field>
    <field name="inherit_id" ref="base.view_partner_form"/>
    <field name="arch" type="xml">
        <xpath expr="//field[@name='zip']" position="attributes">
            <attribute name="placeholder">Postal code</attribute>
            <attribute name="string">Postal_code</attribute>
        </xpath>
        <xpath expr="//field[@name='state_id']" position="attributes">
            <attribute name="placeholder">Province</attribute>
            <attribute name="string">Province</attribute>
        </xpath>
          <xpath expr="//field[@name='mobile']/.." position="after">
            <label for="fax_number"/>
            <div>
                <field name="fax_number"/>
            </div>
        </xpath>
    </field>
</record>
</odoo>


I have done this before with success but now no matter what form i try to change it comes up with the same error

Field does not exist




thanks in advance


Justin