ADT packaging fails

I have a question for EDK usage.

I'm trying to test helloworldExtensionClient to test EDK.

I create swf file, HelloWorldExtensionClient.swf, with flash professional using external library options as suggested.

It, however, keeps failing for airn packaging like below,

#adt -package -storetype pkcs12 -keystore ./phonyEdkAneCert.p12 -storepass phony -tsa none -target airn ./HelloWorldExtensionClient.airn ./HelloWorldExtensionClient-app.xml  ./HelloWorldExtensionClient.swf icons  -extdir C:\extensions

.\HelloWorldExtensionClient-app.xml(149): error 105: application.extensions.extensionID contains an invalid value

#dir C:\extensions

05/24/2011  05:41 PM             6,123 tv.adobe.extension.example.HelloWorld.ane

05/24/2011  05:41 PM             6,123 tv.adobe.extension.example.HelloWorld.swc

Around line 149 of xml file shows this

    <extensions>
       <extensionID>
           tv.adobe.extension.example.HelloWorld
       </extensionID>
    </extensions>

Could you let me know what the reason might be for this failure?  Is there anything I can try to figure out the problem?