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@ashnazg is right but I want to improve your answer with an example.

A File-level DocBlock should be the first docblock and must have a Summary (in this example the summary is "Class Category | core/Category.class.php"). Then a Class-level DocBlock is placed before a class definition.

<?php
/**
 * Class Category | core/Category.class.php
 *
 * @package     MyApp XYZ
 * @subpackage  Categories
 * @author      Sandro Miguel Marques <[email protected]>
 * @version     v.1.1 (06/12/2016)
 * @copyright   Copyright (c) 2016, Sandro
 */

namespace Myapp;

use \PDO;
use \Exception;
use \PDOException;

/**
 * Class Category - active record
 *
 * Recipe categories
 */
class Category {

    ...

But does the top of your file have two such docblocks? The first docblock is expected to be the one for the file itself, and a second docblock should pair up with the first documentable code element that appears after it.

However, if you only have one docblock at the top of the file, it will get paired up with the first code element found, thus the "file itself" will seem to be missing its docblock. That is what that error is supposed to indicate.