I have created custom module configuration in admin panel for Enable in fronted and Heading title. But the settings is not visible in the admin Store > Settings > Configuration.

I am following the below tutorial steps:

http://www.mage-world.com/blog/how-to-create-the-configuration-via-backend-for-a-custom-module.html

I have run the command setup:upgrade and cache:flush already and also it's not showing any error. I am using Magento ver. 2.1.3.

Please see the attached screenshot.

[![screenshot][1]][1]


  [1]: https://i.sstatic.net/xcXOv.png

My system.xml file code is:


    <?xml version="1.0"?>
     
    <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
        <system>
            <tab id="tutorial" translate="label" sortOrder="1">
                <label>Tutorial</label>
            </tab>
            <section id="tutorial_simplenews" translate="label" sortOrder="1" showInDefault="1" 
    showInWebsite="1" showInStore="1">
                <label>Simple News</label>
                <tab>tutorial</tab>
                <resource>Tutorial_SimpleNews::config</resource>
                <group id="general" translate="label" type="text" sortOrder="1" showInDefault="1" 
    showInWebsite="1" showInStore="1">
                    <label>General Settings</label>
                    <field id="enable_in_frontend" translate="label" type="select" sortOrder="1" 
    showInDefault="1" showInWebsite="1" showInStore="1">
                        <label>Enable in frontend</label>
                        <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                    </field>
                    <field id="head_title" translate="label comment" type="text" sortOrder="2" 
    showInDefault="1" showInWebsite="1" showInStore="1">
                        <label>Head title</label>
                        <comment>Fill head title of news list page at here</comment>
                        <validate>required-entry</validate>
                    </field>
                    <field id="lastest_news_block_position" translate="label" type="select" 
    sortOrder="3" showInDefault="1" showInWebsite="1" showInStore="1">
                        <label>Lastest news block position</label>
                        <source_model>
                            Tutorial\SimpleNews\Model\System\Config\LastestNews\Position
                        </source_model>
                    </field>
                </group>
            </section>
        </system>
    </config>