Why is the auth_key parameter empty?

Question

I've created a flex-based application and uploaded it to vkontakte. For some reason the auth-key parameter (at the flash vars) is empty, how come?

Here is a link to the application.

EDIT:

Here is my application tag inside the site:

<embed width="607" height="590" flashvars="api_id=1549899&amp;viewer_id=47745507&
amp;viewer_type=2&amp;user_id=47745507&amp;group_id=0&amp;is_app_user=1&amp;
auth_key=&amp;language=3" allowscriptaccess="never" allownetworking="internal"
allowfullscreen="true"
quality="high" name="player" id="player" style="" src="http://cs1830.vkontakte.ru  
/u47745507/13de6ae4d52c69.zip" type="application/x-shockwave-flash"/>

Here is other application tag inside the site:

<embed width="607" height="570" flashvars="api_id=1457219&amp;viewer_id=47745507&
amp;viewer_type=0&amp;user_id=0&amp;group_id=0&amp;is_app_user=1&
amp;auth_key=2a3d8454de9f7a7ada0750050e686b01&amp;language=3" allowscriptaccess="never" 
allownetworking="all" allowfullscreen="true" quality="high" name="player" id="player" 
style="" src="http://cs4232.vkontakte.ru/u1304144/c1fd79dcbe47ec.zip" 
type="application/x-shockwave-flash"/>

Answer 1

When editing application settings, you must "payment on" in the "Payments" tab. Then parameter auth_key will be filled.