H i  everyone, I am using an Odoo 10 and I encountered an error(see error below) and I don't know what this means.  This error occurred when I made a customized template for the vendor bill report.  Would anyone know the solution to this? thanks!

Error to render compiling AST
MissingError: (u'Record does not exist or has been deleted. ', None)
Template: 1176
Path: / templates / t / t / t / t [1]
Node: <t t-call = "account.report_vendor_bill_header" t-lang = "o.partner_id.lang" />

My code:

<template id = "report_vendor_bill">

            <t t-call = "report.html_container">

                <t-foreach = "docs" t-as = "o">

                    <t t-call = "account_custom.report_vendor_bill_header" t-lang = "o.partner_id.lang" />

                    <t t-call = "account_custom.report_vendor_bill_document" t-lang = "o.partner_id.lang" />

                </t>

            </t>

        </template>