I modified the odoo.conf

addons_path = C:\Program Files (x86)\Odoo 11.0\server\odoo\addons,C:\Users\user1\Downloads\1

and create a silkworm in  C:\Users\user1\Downloads\1

and then create a __init__.py

its content as below:

import silkworm

add a __manifest__.py

{

'name': 'Screen Printing2',

'version': '1.0',

'description': """

This module adds functionality for

screen printing companies

""",

'author': 'Greg Moss',

'depends': ['base'],

'update_xml': ['silkworm_view.xml'],

'demo': [],

'installable': True,

'auto_install': False,

}

add silkworm_view.xml

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

<Odoo>

<data>

<record id="view_student_form" model="ir.ui.view">

<field name="name">student.det.student.view</field>

<filed name="model">student.det</filed>

<field name="type">form</field>>

<field name="arch" type="xml">

<form string="Student Details">

<field name="name" select="1"/>

<filed name="dateofbirth" />

</form>

</field>

</record>

</data>

</Odoo>

Add silkworm.py

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

# Part of Odoo. See LICENSE file for full copyright and licensing details.

class student_info(osv, osv):

_name = "student.info"

_columns = {

'name': fields.char('Name', size=20, required=True),

'roll_no': fields.integer('Roll No:', required=True)

}

student_info()# -*- coding: utf-8 -*-

# Part of Odoo. See LICENSE file for full copyright and licensing details.

class student_info(osv, osv):

_name = "student.info"

_columns = {

'name': fields.char('Name', size=20, required=True),

'roll_no': fields.integer('Roll No:', required=True)

}

student_info()

I update module list and then I can see the app in App List.

But I install the app, it appear the error message as below:

An error occurred

Please use the copy button to report the error to your support service.

Odoo Server Error

Traceback (most recent call last):
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\http.py", line 647, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\http.py", line 307, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\tools\pycompat.py", line 87, in reraise
    raise value
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\http.py", line 689, in dispatch
    result = self._call_function(**self.params)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\http.py", line 339, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\service\model.py", line 97, in wrapper
    return f(dbname, *args, **kwargs)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\http.py", line 332, in checked_call
    result = self.endpoint(*a, **kw)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\http.py", line 933, in __call__
    return self.method(*args, **kw)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\http.py", line 512, in response_wrap
    response = f(*args, **kw)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\addons\web\controllers\main.py", line 934, in call_button
    action = self._call_kw(model, method, args, {})
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\addons\web\controllers\main.py", line 922, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\api.py", line 689, in call_kw
    return call_kw_multi(method, model, args, kwargs)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\api.py", line 680, in call_kw_multi
    result = method(recs, *args, **kwargs)
  File "<decorator-gen-40>", line 2, in button_immediate_install
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\addons\base\module\module.py", line 71, in check_and_log
    return method(self, *args, **kwargs)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\addons\base\module\module.py", line 448, in button_immediate_install
    return self._button_immediate_function(type(self).button_install)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\addons\base\module\module.py", line 541, in _button_immediate_function
    modules.registry.Registry.new(self._cr.dbname, update_module=True)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\modules\registry.py", line 85, in new
    odoo.modules.load_modules(registry._db, force_demo, status, update_module)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\modules\loading.py", line 343, in load_modules
    loaded_modules, update_module)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\modules\loading.py", line 242, in load_marked_modules
    loaded, processed = load_module_graph(cr, graph, progressdict, report=report, skip_modules=loaded_modules, perform_checks=perform_checks)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\modules\loading.py", line 156, in load_module_graph
    _load_data(cr, module_name, idref, mode, kind='data')
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\modules\loading.py", line 94, in _load_data
    tools.convert_file(cr, module_name, filename, idref, mode, noupdate, kind, report)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\tools\convert.py", line 788, in convert_file
    convert_xml_import(cr, module, fp, idref, mode, noupdate, report)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\tools\convert.py", line 836, in convert_xml_import
    relaxng.assert_(doc)
  File "src\lxml\etree.pyx", line 3557, in lxml.etree._Validator.assert_
AssertionError: Document does not comply with schema

Does somebody know how to solve this problem?

And suggest the article or sample about Odoo 11 create a custom app?