[flexcoders] Modules error issue

[one_rabbit_one]

Can anyone please throw any light on this? 

I have a project with four modules in it, skinned with 'Brownie' CSS. If there 
is an error - the alert does not fire,instead I get this 1009 error:

TypeError: Error #1009: Cannot access a property or method of a null object 
reference.
        at 
assets.assets_Brownie.skins::SmartPanelSkin/http://www.adobe.com/2006/flex/mx/internal::drawBorder()[/Users/inkthing/Sites/flex/InkyMod/src/assets/assets_Brownie/skins/SmartPanelSkin.as:39]
        at 
mx.skins.halo::HaloBorder/updateDisplayList()[C:\autobuild\3.3.0\frameworks\projects\framework\src\mx\skins\halo\HaloBorder.as:233]
        at 
mx.skins::ProgrammaticSkin/validateDisplayList()[C:\autobuild\3.3.0\frameworks\projects\framework\src\mx\skins\ProgrammaticSkin.as:421]
        at 
mx.managers::LayoutManager/validateDisplayList()[C:\autobuild\3.3.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:622]
        at 
mx.managers::LayoutManager/doPhasedInstantiation()[C:\autobuild\3.3.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:695]
        at Function/http://adobe.com/AS3/2006/builtin::apply()
        at 
mx.core::UIComponent/callLaterDispatcher2()[C:\autobuild\3.3.0\frameworks\projects\framework\src\mx\core\UIComponent.as:8628]
        at 
mx.core::UIComponent/callLaterDispatcher()[C:\autobuild\3.3.0\frameworks\projects\framework\src\mx\core\UIComponent.as:8568]