Error message after upgrading Flash Player 9 to Flash Player 11
This error exists when you installed Adobe Flash Player 220.127.116.11 or higher. This occurs when you download it from the Adobe download site and then installed the Flex Builder 2 afterwards.
It could also be because you installed Flex Builder 2 and then you attempted to update your Flash Player to standard version 9.0.28 or higher. Sometimes, Flex Builder 2 will not disregard the standard Flash when installing.
Here is the fix to install the Debug Flash Player for enhancement:
1. Identify the web browser that Flex Builder used to debug. Launch Flex Builder 2 and then choose Window and then go to Preferences. Under the Preferences tree, choose General and then Web Browser. Confirm that the external web browser is selected.
2. Confirm that the browser you choose doesn't have the debug Flash Player. Go here for details. Right-click on the Flash movie. If you already have the debug Adobe Flash Player, you will notice Debugger under the context menu.
3. Install the debug Adobe Flash Player for the correct web browser stated in Step 1.
4. Verify that the Debugger is displayed in the context menu by doing the step 2 again and that you have the Debug Adobe Flash Player installed.