Getting below error when I add value_description field into view. It is fine if I don't include it. 

Please advice.

web.assets_web.min.js:959 Uncaught OwlError: An error occured in the owl lifecycle (see this Error's "cause" property)

    at handleError (web.assets_web.min.js:959:101)

    at App.handleError (web.assets_web.min.js:1610:29)

    at RootFiber.complete (web.assets_web.min.js:991:28)

    at Scheduler.processFiber (web.assets_web.min.js:1577:43)

    at Scheduler.processTasks (web.assets_web.min.js:1571:62)

    at web.assets_web.min.js:1568:67Caused by: TypeError: this.child.mount is not a function

    at VToggler.mount (web.assets_web.min.js:715:57)

    at VMulti.mount (web.assets_web.min.js:784:164)

    at B.mount (web.assets_web.min.js:875:269)

    at VMulti.mount (web.assets_web.min.js:784:164)

    at VList.mount (web.assets_web.min.js:887:253)

    at B.mount (web.assets_web.min.js:875:269)

    at VToggler.mount (web.assets_web.min.js:715:57)

    at VList.mount (web.assets_web.min.js:887:253)

    at VMulti.mount (web.assets_web.min.js:784:164)

    at VMulti.mount (web.assets_web.min.js:784:164)

<odoo>
    <record id="trbrd_parameter_value_report_view_list" model="ir.ui.view">
        <field name="name">trbrd.parameter.value.report.view.list</field>
        <field name="model">trbrd.parameter.value.report</field>
        <field name="arch" type="xml">
            <list string="Parameter Value Summary">
                <field name="id"/>
                <field name="value_float"/>
                <field name="value_str"/>
                <field name="value_bool"/>
                <field name="value_date"/>
                <field name="value_description"/>
            </list>
        </field>
    </record>

    <record id="action_trbrd_parameter_value_report" model="ir.actions.act_window">
        <field name="name">Parameters</field>
        <field name="res_model">trbrd.parameter.value.report</field>
        <field name="view_mode">list</field>
        <field name="view_id" ref="trbrd_parameter_value_report_view_list"/>
        <field name="help" type="html">
            <p class="o_view_nocontent_smiling_face">
                No date yet!
            </p>
            <p>
                Create some parameters or you cannot make any calculation.
            </p>
        </field>
    </record>

    <menuitem id="menu_parameter_value_report"
              name="Parameter Value Report"
              parent="menu_trbrd_parameters"
              action="action_trbrd_parameter_value_report"
              sequence="80"/>

</odoo>


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

from odoo import fields, models, tools

class ParameterValueReport(models.TransientModel):
    _name = 'trbrd.parameter.value.report'
    _description = 'All Parameter Values'
    _auto = False
    _log_access = True

    value_float = fields.Float(string='Value (Float)', readonly=True, required=True)
    value_str = fields.Char(string='Value (Str)', readonly=True, required=True)
    value_bool = fields.Boolean(string='Value (Boolean)', readonly=True, required=True)
    value_date = fields.Date(string='Value (Date)', readonly=True, required=True)
    value_description = fields.Char(string='Descriptionxxxxx', readonly=True, required=False)

    def init(self):
        tools.drop_view_if_exists( self.env.cr , self._table)
        self._cr.execute("""
            CREATE OR REPLACE VIEW tbrd_parameter_value_report AS (
                SELECT
                    *
                FROM trbrd_parameter_value pv
            )
        """)