Defining action hooks on tables not woking

[benhaynes]

From directus created by rainst : directus/directus#2199

Version Info

• 6.4.9 (ab5a935)
• PHP version: 5.6.33
• MySQL version: MariaDB 10.1.30
• Web server: Apache
• OS name and version: Windows (Xampp)

I'm trying to implement an action hook after updating or inserting a new row in a table called pages, this is the expected implementation following the reference:

    'hooks' => [
        'table.update.pages:after' => function ($table, $data) {
            file_put_contents('testing.txt', $table . ":\r\n" . json_encode($data) . "\r\n", FILE_APPEND);
        },
        'table.insert.pages:after' => function ($table, $data) {
            file_put_contents('testing.txt', $table . ":\r\n" . json_encode($data) . "\r\n", FILE_APPEND);
        }
    ]

but when I try to insert or edit something I get this response from the API, where line 81 is the one where the update hook is defined.

{
  "success":false,
  "error":{
    "message":"Missing argument 2 for Directus\\Bootstrap::{closure}()"
  },
  "code":2,
  "class":"ErrorException",
  "file":"C:\\xampp\\htdocs\\directus\\api\\configuration.php",
  "line":81
}

If I remove the pages filter it works as expected, it triggers for every table
'table.update:after' => function ($table, $data) { ... }

What am I doing wrong here?
thank you!