TypeError: Error #1034: Type Coercion failed: cannot convert mx.managers::PopUpManagerImpl@c786731 to mx.managers.IPopUpManager.at mx.managers::PopUpManager$/get impl()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\managers\PopUpManager.as:68]at mx.managers::PopUpManager$/addPopUp()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\managers\PopUpManager.as:169]at mx.controls::Alert$/..