Actionscript project that loads a Flex SWF, "Could not find resource bundle" Error when using LayoutManager

Question

Hi guys. I'm using an actionsciprt only project (under FlashDevelop) to load an .swf flex file built by another department of the company I work for. Using the follwing code:

var mLoader:Loader = new Loader();
var mRequest:URLRequest = new URLRequest('flexSWF.swf');
mLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, onCompleteHandler);
mLoader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onProgressHandler);          
mLoader.load(mRequest); 

That worked fine until I wanted to use Flex's mx.managers.LayoutManager. I've added the this line to my class:

import mx.managers.ILayoutManagerClient;
import mx.managers.LayoutManager;

.
.
.

private var _layoutManager:LayoutManager;

And I get this run time error:

Error: Could not find resource bundle messaging at mx.resources::ResourceBundle$/getResourceBundle()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\resources\ResourceBundle.as:143] at mx.utils::Translator$cinit() at global$init() at mx.messaging.config::ServerConfig$cinit() at global$init() at _app_FlexInit$/init() at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::docFrameHandler()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\managers\SystemManager.as:3217] at mx.managers::SystemManager/docFrameListener()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\managers\SystemManager.as:3069]

commenting the LayoutManager line, the swf works fine. But I do want to use LayoutManager.

Any hints?