how can solve fetal eror

I'm getting the following error:

and my site login page is not load.

1- PHP Warning: require_once(vendor/composer/autoload_real.php): failed to open stream: No such file or directory in /home/araztrad/public_html/rafel/vendor/autoload.php on line 4

2- PHP Fatal error: require_once(): Failed opening required 'vendor/composer/autoload_real.php' (include_path='.:/opt/alt/php71/usr/share/pear') in /home/araztrad/public_html/rafel/vendor/autoload.php on line 4

i am using 1gig host and 400 meg is used.

autoload_real.php file:

application/x-httpd-php autoload_real.php ( C++ source, ASCII text )
<?php
require 'ClassLoader.php';
// autoload_real.php @generated by Composer

class ComposerAutoloaderInit3e367bb88a068bb6cae8ead6ede211f2
{

    private static $loader;

    public static function loadClassLoader($class)
    {
        if ('Composer\Autoload\ClassLoader' === $class) {
            require 'ClassLoader.php';
        }
    }

    public static function getLoader()
    {


        if (null !== self::$loader) {
            return self::$loader;
        }

        spl_autoload_register(array('ComposerAutoloaderInit3e367bb88a068bb6cae8ead6ede211f2', 'loadClassLoader'), true, true);

        self::$loader = $loader = new \Composer\Autoload\ClassLoader();

        spl_autoload_unregister(array('ComposerAutoloaderInit3e367bb88a068bb6cae8ead6ede211f2', 'loadClassLoader'));

        $useStaticLoader = PHP_VERSION_ID >= 50600 && !defined('HHVM_VERSION') && (!function_exists('zend_loader_file_encoded') || !zend_loader_file_encoded());
        if ($useStaticLoader) {

            require_once 'autoload_static.php';

            call_user_func(\Composer\Autoload\ComposerStaticInit3e367bb88a068bb6cae8ead6ede211f2::getInitializer($loader));
        } 

        else {
            $map = require 'autoload_namespaces.php';

            foreach ($map as $namespace => $path) {
                $loader->set($namespace, $path);
            }

            $map = require 'autoload_psr4.php';

            foreach ($map as $namespace => $path) {
                $loader->setPsr4($namespace, $path);
            }

            $classMap = require '/home/araztrad/public_html/rafel/vendor/composer/autoload_classmap.php';

            if ($classMap) {
                $loader->addClassMap($classMap);
            }
        }

        $loader->register(true);

        if ($useStaticLoader) {
            $includeFiles = Composer\Autoload\ComposerStaticInit3e367bb88a068bb6cae8ead6ede211f2::$files;
        } else {
            $includeFiles = require 'autoload_files.php';
        }
        vardump($includeFiles);
        echo 'hadi1';die;
        foreach ($includeFiles as $fileIdentifier => $file) {
            composerRequire3e367bb88a068bb6cae8ead6ede211f2($fileIdentifier, $file);
        }
         //echo 'hadi1';die;  
        return $loader;
    }
}

function composerRequire3e367bb88a068bb6cae8ead6ede211f2($fileIdentifier, $file)
{
    if (empty($GLOBALS['__composer_autoload_files'][$fileIdentifier])) {
        require $file;

        $GLOBALS['__composer_autoload_files'][$fileIdentifier] = true;
    }
}

autoload.php file code:

<?php
// autoload.php @generated by Composer

require_once 'vendor/composer/autoload_real.php';

$x=ComposerAutoloaderInit3e367bb88a068bb6cae8ead6ede211f2::getLoader();
if($x){
    echo 'yse';die;
}

else{
    echo 'no';die;
}