<td style="padding: 0.25rem; vertical-align: middle;">
<!--                            <span t-esc="o.line_ids.filtered(lambda line: line.code == 'ETF').mapped('total')[0] if o.line_ids.filtered(lambda line: line.code == 'ETF') else ''"-->
<!--                                  t-options="{'widget': 'monetary', 'display_currency': o.company_id.currency_id}"/>-->
                             <span t-esc="sum(o.line_ids.filtered(lambda line: line.code == 'ETF').mapped('total')"
                                  t-options="{'widget': 'monetary', 'display_currency': o.company_id.currency_id}"/>

                        </td>

Those two spans are same span by differentr ways,one is  commented, but error occure,  How can i solve this  , 

*first method error,odoo.addons.base.models.ir_qweb.QWebError: Error while rendering the template:

    ValueError: The value send to monetary field is not a number.

    Template: hr_payroll.report_payslip

    Reference: 1571

    Path: /t/t/div/table[1]/tbody/tr[4]/td[2]/span

    Element: <span t-esc="o.line_ids.filtered(lambda line: line.code == \'ETF\').mapped(\'total\')[0] if o.line_ids.filtered(lambda line: line.code == \'ETF\') else \'\'" t-options="{\'widget\': \'monetary\', \'display_currency\': o.company_id.currency_id}"/>

*second method  error,odoo.addons.base.models.ir_qweb.QWebError: Error while rendering the template:

    ValueError: Can not compile expression: sum(o.line_ids.filtered(lambda line: line.code == 'ETF').mapped('total')

    Template: hr_payroll.report_payslip_lang, How can i solve this? can someone help me?