odoo.tools.convert.ParseError: "Error while validating constraint

Field `roll_no` does not exist

Error context:
View `school.new`
[view_id: 516, xml_id: n/a, model: ir.module.module, parent_id: n/a]
None" while parsing /home/ahmed/Documents/odoo/addons/HelloModule/views/school.xml:3, near
<record id="school_from_view" model="ir.ui.view">
        <field name="name">school.new</field>
        <field name="model">ir.module.module</field>
        <field name="arch" type="xml">
        <form>
            <sheet>
                <form>

                    <field name="name"/>
                    <field name="roll_no"/>
                    <field name="divison"/>
                </form>
            </sheet>
        </form>
        </field>
    </record>

moedels/__init__.py

from . import classroom

models/classroom.py

from . import api,fields,models
class SchoolNew(models.Model):    

    _name= 'school.new'    

    name = fields.Char(string="Name")    

    roll_no = fields.Interger('Rollno')        

    divison = fields.Char('div')        

views/school.xml

<?xml version="1.0" encoding="utf-8"?><odoo>    <record id="school_from_view" model="ir.ui.view">        <field name="name">school.new</field>        <field name="model">ir.module.module</field>        <field name="arch" type="xml">        <form>            <sheet>                <form>
                    <field name = "name"/>                    <field name = "roll_no"/>                    <field name = "divison"/>                </form>            </sheet>        </form>        </field>    </record>    <record id="school_action_new" model="ir.actions.act_window">        <field name="name">School.new</field>        <field name="res_model">schoolNew</field>            <field name="view_type">form</field>        <field name="view_mode">form</field>    </record>       <menuitem name="School"                id="menu_school"/>    <menuitem                 name = "classroom"                parent="menu_school"                action = "school_action_new"                id="menu_classroom"/>        </odoo>