after publishing and going to the URL one of my master page is not visible on the page it suppose to be.

i have caught another exception:
TypeError: Error #1010: A term is undefined and has no properties.
at com.iplotz.view::ComponentAdd/elementAdd()
at com.iplotz.view::Comments/componentToPage()
at com.iplotz.view::Comments/pageAddElements()
at viewer/changeComWire()
at com.iplotz.leftlist::PageList/doGetLoadWireframe()
at com.iplotz.leftlist::PageList/___PageList_Operation1_result()
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.rpc::AbstractOperation/http://www.adobe.com/2006/flex/mx/internal::dispatchRpcEvent()
at mx.rpc::AbstractInvoker/http://www.adobe.com/2006/flex/mx/internal::resultHandler()
at mx.rpc::Responder/result()
at mx.rpc::AsyncRequest/acknowledge()
at NetConnectionMessageResponder/resultHandler()
at mx.messaging::MessageResponder/result()