I'm trying to create a pdf report but the error occurs when i add

in template

This is the error:
odoo.addons.base.models.ir_qweb.QWebException: Error when compiling xml template
AssertionError: t-field can not be used on a t element, provide an actual HTML node
Template: school.print_student_badge
Path: /t/t/t/t/div/t
Node:

this is the code of the report xml file:

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

    id="school_report_action" model="ir.actions.report">
        name="name">Print Badge
        name="model">school.student
        name="report_type">qweb-pdf
        name="report_name">school.print_student_badge
        name="report_file">school.print_student_badge
        name="binding_model_id" ref="model_school_student"/>
        name="binding_type">report
    
    id="print_student_badge">
        t-call="web.html_container">
            t-foreach="docs" t-as="o">
                t-call="web.external_layout">
                    
class="page">
                        

                            Student reoprt
                        
                        
Name Student:
                        t-field="o.name"/>