Help with validation rule in behaviour

Hi guys,

I am completely stuck and cannot figure out what I am doing wrong.

I have created a custom Upload behaviour but I cannot get the
following validation rule to work.

Just after the setup function in the behaviour I call this function
_create_validation_rule(&$model){} which sets the validation rules,
for my suprise nothing happens. When I call the function from inside
the beforeValidate function it works, but Cake display the following
error:

Warning (2): preg_match() expects parameter 2 to be string, array
given [CORE\cake\libs\validation.php, line 877]

When I checked the validation.php and pr ( ) the second paramenter it
showed the file array:
Array
(
[filename] => Array
(
[name] =>
[type] =>
[tmp_name] =>
[error] => 4
[size] => 0
)

)

I must be doing something wrong somewhere, just don't know where and
how to fix it.

Any help would very much appreciated.

Many thanks in advance.

Cheerss
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