You need the debug version of the player installed. This guy seems to have some good info on where to get it and how to setup flex builder: http://www.flexer.info/2008/08/18/flash-player-10-debug-is-out/ HTH, Ryan
________________________________ From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of markgoldin_2000 Sent: Thursday, October 02, 2008 12:19 PM To: flexcoders@yahoogroups.com Subject: [flexcoders] Developing with Flash Player 10a I have installed that version but when I run it from Builder I am getting: C:\WINDOWS\system32\Macromed\Flash\Flash10a.ocx Flex Builder cannot locate the required debugger version of Flash Player. You might need to install the debugger version of Flash Player 9 or reinstall Flex Builder. Do you want to try to debug with the current version? What am I doing wrong? This message is private and confidential. If you have received it in error, please notify the sender and remove it from your system.