The argument should be an array

Question

Hi, we've a warning when I send a message from a form with chronoforms 4.0 (25.April.2013)
Warning: array_values() [function.array-values]: The argument should be an array in /var/www/html/xxxxxxxxxx/administrator/components/com_chronoforms/form_actions/email/email.php on line 205

Warning: Invalid argument supplied for foreach() in /var/www/html/xxxxxxxxxx/administrator/components/com_chronoforms/form_actions/email/email.php on line 206

Thank you
I've added debugger:
Data Array:

Array
(
    [option] => com_chronoforms
    [view] => form
    [Itemid] => 711
    [template] => component
    [oggetto] => 
    [chronoform] => personalizza
    [event] => submit
    [input_text_1] => Rossi
    [input_text_2] => gigi@mymail.com
    [input_textarea_3] => kopko
    [input_file_4] => 20130523100124_3341867340.jpg
    [input_textarea_5] => 
    [input_file_6] => 
    [chrono_verification] => b7Ugx
    [input_submit_7] => Send
    [3d5f2de8165f0ddf381d28c75ae4a9e0] => 1
    [_PLUGINS_] => Array
        (
            [upload_files] => Array
                (
                    [input_file_4] => Array
                        (
                            [name] => 20130523100124_3341867340.jpg
                            [original_name] => 3341867340.jpg
                            [path] => /var/www/html/xxxxxxxxxx/components/com_chronoforms/uploads/personalizza/20130523100124_3341867340.jpg
                            [size] => 34256
                            [link] => http://yyyyyy.ccc/xxxxxxxxxx/components/com_chronoforms/uploads/personalizza/20130523100124_3341867340.jpg
                        )

)

Validation Errors:

Array
(
)

Thank you!
Debug Data

Core Captcha
        Passed the core captcha check!
    Upload routine started for file upload by : input_file_4
    /var/www/html/xxxxxxxxxxxx/components/com_chronoforms/uploads/personalizza/20130523100124_3341867340.jpg has been uploaded successfully.
    email
        3
            Result An email has been SENT successfully from (Rossi)gigi@mymail.com to support@yourmail.com            Body
            Cognome Nome 	Rossi
            email 	gigi@mymail.com
            Testo 1 	kopko
            Immagine 1 	20130523100124_3341867340.jpg
            Testo 2 	
            Immagine 2

Submitted by 192.168.3.100
            Attachments array ( 0 => '/var/www/html/xxxxxxxxxxxx/components/com_chronoforms/uploads/personalizza/20130523100124_3341867340.jpg', )
How can I found the problem?Thanks in advance

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The argument should be an array