```php
// autoload.php
spl_autoload_register(function ($class) {
$prefix = 'App\\';
$base_dir = __DIR__ . '/';

if (strpos($class, $prefix) === 0) {
$relative_class = substr($class, strlen($prefix));
$file = $base_dir . str_replace('\\', '/', $relative_class) . '.php';

if (file_exists($file)) {
require $file;
}
}
});
```<br />
<b>Fatal error</b>:  Uncaught Error: Class &quot;App&quot; not found in /home/magazin1/b11.magazineb10.com/index.php:18
Stack trace:
#0 {main}
  thrown in <b>/home/magazin1/b11.magazineb10.com/index.php</b> on line <b>18</b><br />