Not filtering by category

I am still having problems showing a lists of related posts on post.php (category related). I am using Clive Walker's method that Simon Clay told me, but is not working for me:

//Get the categories for the current post 
$categories = perch_blog_post_categories(perch_get('s'), array(
    'skip-template' => true, ));

//The post may be in more than one category, so we need to loop through these and get the category slugs
if (count($categories)) {
    $cat_slugs = array();
    foreach($categories as $cat) {
        $cat_slugs[] = $cat['catSlug'];
    }

    //Display two related posts, ordered by date, excluding the current post
    perch_blog_custom(array(

        'category' => $cat_slugs, // it show all if i remove this line
        'sort' => 'postDateTime',
        'sort-order' => 'DESC',
        'count' => 2000,
        'template' => 'proyectos.html',
    ));
}

Debug:

Debug Message - Perch 3.0.4
[1] SELECT SQL_CALC_FOUND_ROWS DISTINCT tbl.* FROM ( SELECT idx.itemID, main.*, idx2.indexValue as sortval FROM perch3_blog_index idx JOIN perch3_blog_posts main ON idx.itemID=main.postID AND idx.itemKey='postID' JOIN perch3_blog_index idx2 ON idx.itemID=idx2.itemID AND idx.itemKey='postID' AND idx2.indexKey='_id' WHERE 1=1 AND ((idx.indexKey='postSlug' AND idx.indexValue='bbb')) AND idx.itemID=idx2.itemID AND idx.itemKey=idx2.itemKey GROUP BY idx.itemID, idx2.indexValue, postID ) as tbl WHERE (postStatus='Published' AND postDateTime<='2017-05-30 13:12:00' ) GROUP BY itemID, sortval ORDER BY sortval ASC LIMIT 0, 10
[1] SELECT FOUND_ROWS() AS `count`
[24] SELECT DISTINCT settingID, settingValue FROM perch3_settings WHERE userID=0
[1] Using template: /templates/blog/slug2.html
[1] SELECT * FROM perch3_blog_sections ORDER BY sectionTitle ASC
[1] SELECT * FROM perch3_blogs ORDER BY blogTitle ASC
[45] SELECT regionKey, regionHTML FROM perch3_content_regions WHERE regionPage='/proyecto.php' OR regionPage='*' ORDER BY regionPage DESC
[1] SELECT SQL_CALC_FOUND_ROWS DISTINCT tbl.* FROM ( SELECT idx.itemID, main.*, idx2.indexValue as sortval FROM perch3_blog_index idx JOIN perch3_blog_posts main ON idx.itemID=main.postID AND idx.itemKey='postID' JOIN perch3_blog_index idx2 ON idx.itemID=idx2.itemID AND idx.itemKey='postID' AND idx2.indexKey='_id' WHERE 1=1 AND ((idx.indexKey='postSlug' AND idx.indexValue='bbb')) AND idx.itemID=idx2.itemID AND idx.itemKey=idx2.itemKey GROUP BY idx.itemID, idx2.indexValue, postID ) as tbl WHERE (postStatus='Published' AND postDateTime<='2017-05-30 13:12:00' ) GROUP BY itemID, sortval ORDER BY sortval ASC LIMIT 0, 10
[1] SELECT FOUND_ROWS() AS `count`
[1] Using template: /templates/blog/post.html
[3] SELECT SQL_CALC_FOUND_ROWS DISTINCT tbl.* FROM ( SELECT idx.itemID, main.*, idx2.indexValue as sortval FROM perch3_blog_index idx JOIN perch3_blog_posts main ON idx.itemID=main.postID AND idx.itemKey='postID' JOIN perch3_blog_index idx2 ON idx.itemID=idx2.itemID AND idx.itemKey='postID' AND idx2.indexKey='postDateTime' WHERE 1=1 AND idx.itemID=idx2.itemID AND idx.itemKey=idx2.itemKey GROUP BY idx.itemID, idx2.indexValue, postID ) as tbl WHERE (postStatus='Published' AND postDateTime<='2017-05-30 13:12:00' ) GROUP BY itemID, sortval ORDER BY sortval DESC LIMIT 0, 10000
[1] SELECT FOUND_ROWS() AS `count`
[3] Using template: /templates/blog/proyectos.html
Array
(
    [type] => 8
    [message] => Use of undefined constant perch_blog - assumed 'perch_blog'
    [file] => /Applications/MAMP/htdocs/optaarquitectos.com/perch/config/apps.php
    [line] => 3
)

Diagnostics

Perch: 3.0.5, PHP: 5.4.4, MySQL: 5.5.25, with PDO
Server OS: Darwin, apache2handler
Installed apps: content (3.0.5), assets (3.0.5), categories (3.0.5), perch_blog (5.5.1)
App runtimes: <?php $apps_list = [ perch_blog, ];
PERCH_LOGINPATH: /perch
PERCH_PATH: /Applications/MAMP/htdocs/optaarquitectos.com/perch
PERCH_CORE: /Applications/MAMP/htdocs/optaarquitectos.com/perch/core
PERCH_RESFILEPATH: /Applications/MAMP/htdocs/optaarquitectos.com/perch/resources
Image manipulation: GD
PHP limits: Max upload 32M, Max POST 32M, Memory: 64M, Total max file upload: 32M
F1: 0c66c2e1f82f9e0b7617b2cb8270f2c7
Resource folder writeable: Yes
HTTP_HOST: opta2:8888
DOCUMENT_ROOT: /Applications/MAMP/htdocs/optaarquitectos.com
REQUEST_URI: /perch/core/settings/diagnostics/
SCRIPT_NAME: /perch/core/settings/diagnostics/index.php

Any help?