Launch another extension from within your extension error

hello I have two extension one is a panel and one is a modaless dialog box.
I would like to lanch the modaless dialog box exention from the panel extension.
I did some reasech and I came up with the below code:
var result:SyncRequestResult =CSXSInterface.getInstance().requestOpenExtension("com.media.test","key1=" + IdModel.Edition).
if(SyncRequestResult.COMPLETE == result.status)
trace("com.media.test extension has been successfully open");
however I get a error :
TypeError: Error #1009: Cannot access a property or method of a null object reference.
I must be missing a step here, can anyone help?

Found the probelm, the extesnion name was incorrect

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here is the link to my site. youll notice i did figure out a work around with the "contact us" button but its a huge pain in the butt. i had to create a new domain and a new site then attach the referal index.html to that new domain. todo this for every single button is very difficult.
http://springgardenranch.tk
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http://cafenoir.atspace.com/Hover/
And here's the menu in an iWeb page :
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http://cafenoir.atspace.com/
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Ben Stopford wrote:
Hi Rob
You mention:
If you call back to the same cache service via an invocation service, you still risk a deadlock or a livelock due to thread-pool depletion. It looks like it is working, then you may run into the problem. It is not 100% safe.which sparked my interest. Would you mind elaborating a little further. I'd always assumed that the threadpools for separate services were independent and thus there was no chance of deadlock from cross-service calls such as this.
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Try the same code from an exploded web app.
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