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I am new to Prestashop module development. I am trying to build my first prestashop module[ref: Here is my code.I did everything as in that tutorial written https://devdocs.prestashop-project.org/8/modules/creation/tutorial/ and still have a problem 'Cannot Install module My. The module is invalid and cannot be loaded.' Enviroment PHP:7.4, Prestahop : 8.1.0
 

<?php
if (!defined('_PS_VERSION_')) {
    exit;
}

class MyModule extends Module
{
    public function __construct()
    {
        $this->name = 'mymodule';
        $this->tab = 'front_office_features';
        $this->version = '1.0.0';
        $this->author = 'Firstname Lastname';
        $this->need_instance = 0;
        $this->ps_versions_compliancy = [
            'min' => '1.7.0.0',
            'max' => '8.99.99',
        ];
        $this->bootstrap = true;

        parent::__construct();

        $this->displayName = $this->l('My module');
        $this->description = $this->l('Description of my module.');

        $this->confirmUninstall = $this->l('Are you sure you want to uninstall?');

        if (!Configuration::get('MYMODULE_NAME')) {
            $this->warning = $this->l('No name provided');
        }
    }
    public function install()
    {
        if (Shop::isFeatureActive()) {
            Shop::setContext(Shop::CONTEXT_ALL);
        }

        return (
            parent::install()
            && Configuration::updateValue('MYMODULE_NAME', 'my module')
        );
    }
    public function uninstall()
    {
        return (
            parent::uninstall()
            && Configuration::deleteByName('MYMODULE_NAME')
        );
    }
}