When you run Flex Builder 2 in debug mode you may receive an error "Installed Adobe Flash Player is Not a Debugger. Flex Builder cannot locate the required debug version of Adobe Flash Player. You may need to install the debug version of AdobeFlash Player 9.0 or reinstall Flex Builder. Do you want to try to debug with the current version?"


This condition exists under certain circumstances if you installed the standard Adobe Flash Player, version or higher, from the Adobe download site and later installed Flex Builder 2, or you installed Flex Builder 2 and then updated Adobe Flash Player to standard Adobe Flash Player or higher from the Adobe download site.

In some specific cases, the Flex Builder 2 installer will not override the standard Flash Player version during the installation. You must follow the steps below to install the Debug Flash Player for development.


  1. Verify what web browser Flex Builder is using to debug.
    1. Open Flex Builder 2.
    2. Select Window > Preferences.
    3. From the Preferences tree, select General > Web Browser.

      Verify what external web browser is checked, this will be the browser Flex Builder uses to debug with.

      Note: You may want to run the standard Adobe Flash Player in IE while running the debug Adobe Flash Player in FireFox as your standard debugger or vice versa.
  2. Verify that the browser selected in step 1 does not have the debug Adobe Flash Player installed:

    Right-click on the displayed Adobe Flash movie. If you already have the debug Adobe Flash Player, you will see the word "Debugger" displayed in the context menu as in the image below:

    If you have Debug Adobe Flash Player version 9,0,15,0 installed, you are running the version that shipped with Flex Builder 2 and should update to the latest debug Flash Player version 9,0,28,0 in step 3 below.

  3. Install the debug Adobe Flash Player for the appropriate web browser identified in step 1:

  4. Repeat step 2 to verify you can see "Debugger" displayed in your context menu and that you have Debug Adobe Flash Player 9,0,28,0 installed.

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