Unknown actionscript/php problem

I have created a form in a flash as 2 document. After the user clicks a button it sends 3 variables to PHP, username, email and passwrd. PHP then creates a text file called (username) that contains the username, email and password in a layout flash can read. However, when the button is clicked it does not save the text file.

I have read through these scripts several times and cannot see any faults. I have check permissions and every thing i can think of. Thanks for any help.