Error : VALID_NOT_EMPTY

I hv CakePHP 1.3.6 installed on Ubuntu and learning to create simple
blog. When I add validation to my model, I got this error:

Notice (8): Use of undefined constant VALID_NOT_EMPTY - assumed
'VALID_NOT_EMPTY' [CORE/cake/libs/class_registry.php, line 141]

Here's my model:
<?php
class Blog extends AppModel {
var $name = 'Blog';
var $validate = array(
'title' => array(
'rule' => VALID_NOT_EMPTY,
'message' => 'Title of a blog cannot be empty'
)
);
}
?>

Any idea what this error is all about? Thx for any help.

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