Flex Error - ReferenceError: Error #1065: Variable flash.external::HostObject is not defined

Question

Has anyone gotten this error with FlashBuilder 4.6 and Extension Builder. I do believe I have all the right classes imported and I am using defaults on SDK's and swc's
Code:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" historyManagementEnabled="false">
    <mx:Script>
        <![CDATA[
            import flash.external.*;
            [Bindable]
            private var hostName:String = HostObject.mainExtension;
        ]]>
    </mx:Script>
    <mx:VBox height="100%" width="100%" verticalAlign="middle" horizontalAlign="center">
        <mx:Button label="Run PS code" click="TestPhotoshop.run()" enabled="{hostName.indexOf('photoshop') > -1}"/>
    </mx:VBox>
</mx:Application>

Answer 1

Hi,
SoundCodec class is defined in Player 10. Are you using the
player 10 afcs swc ? If so, you need to change Require Flash Player
Version unser Project->Properties->Flex Compiler in Flex
Builder and put that to 10.0.0 and also make sure that your browser
has player 10 and you Flex SDK also supports player 10.
And if you are using afcs 9 swc , then put 9.0.124 or
something in the Require Flash Player Version and that should fix
the problem
Thanks
Hironmay Basu