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Fatal error: require(): Failed opening required '/html/magento2/vendor/composer/../magefan/module-admin-user-guide/registration.php' (include_path='/html/magento2/vendor/magento/zendframework1/library:/html/magento2/vendor/phpunit/php-file-iterator:/html/magento2/vendor/phpunit/phpunit:/html/magento2/vendor/symfony/yaml:.:/opt/php/7.0/lib/php') in /html/magento2/vendor/composer/autoload_real.php on line 71