Datagrid Paging - TypeError: Error #1009: Cannot access a property or method of a null object reference.

My Error:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at mx.data::RPCDataServiceAdapter/processDataMessage()[C:\depot\DataServices\branches\milestone\lcds45_fb45\frameworks\projects\data\src\mx\data\RPCDataServiceAdapter.as:987]
at RPCDataServiceRequest/invoke()[C:\depot\DataServices\branches\milestone\lcds45_fb45\frameworks\projects\data\src\mx\data\RPCDataServiceAdapter.as:1786]
at mx.data::DataStore/http://www.adobe.com/2006/flex/mx/internal::invoke()[C:\depot\DataServices\branches\milestone\lcds45_fb45\frameworks\projects\data\src\mx\data\DataStore.as:3497]
at Function/<anonymous>()[C:\depot\DataServices\branches\milestone\lcds45_fb45\frameworks\projects\data\src\mx\data\DataStore.as:1716]
at Function/<anonymous>()[C:\depot\DataServices\branches\milestone\lcds45_fb45\frameworks\projects\data\src\mx\data\DataStore.as:1584]
at mx.data::DataStore/http://www.adobe.com/2006/flex/mx/internal::fill()[C:\depot\DataServices\branches\milestone\lcds45_fb45\frameworks\projects\data\src\mx\data\DataStore.as:1771]
at mx.data::ConcreteDataService/internalFill()[C:\depot\DataServices\branches\milestone\lcds45_fb45\frameworks\projects\data\src\mx\data\ConcreteDataService.as:7504]
at Function/<anonymous>()[C:\depot\DataServices\branches\milestone\lcds45_fb45\frameworks\projects\data\src\mx\data\ConcreteDataService.as:1306]
at mx.data::ConcreteDataService/fill()[C:\depot\DataServices\branches\milestone\lcds45_fb45\frameworks\projects\data\src\mx\data\ConcreteDataService.as:1325]
at mx.data::ConcreteDataService/executeQuery()[C:\depot\DataServices\branches\milestone\lcds45_fb45\frameworks\projects\data\src\mx\data\ConcreteDataService.as:1607]
at mx.data::DataManager/executeQuery()[C:\depot\DataServices\branches\milestone\lcds45_fb45\frameworks\projects\data\src\mx\data\DataManager.as:1493]
at Function/http://adobe.com/AS3/2006/builtin::apply()
at mx.data::ManagedOperation/queryProxy()[C:\depot\DataServices\branches\milestone\lcds45_fb45\frameworks\projects\data\src\mx\data\ManagedOperation.as:519]
at mx.rpc.remoting::Operation/send()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/rpc/src/mx/rpc/remoting/Operation.as:220]
at _Super_NewSearch/search()[C:\Users\Robbyn\Adobe Flash Builder 4.7\pressmindv1.1\src\services\newsearch\_Super_NewSearch.as:367]
at Views::NewMediaObjectSearch/startSearch()[C:\Users\Robbyn\Adobe Flash Builder 4.7\pressmindv1.1\src\Views\NewMediaObjectSearch.mxml:1098]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/framework/src/mx/core/UIComponent.as:13160]
at ItemRenderer.Datagrid::GlobalHeaderDatagrid/clientcode_enter()[C:\Users\Robbyn\Adobe Flash Builder 4.7\pressmindv1.1\src\ItemRenderer\Datagrid\GlobalHeaderDatagrid.mxml:154]
at ItemRenderer.Datagrid::GlobalHeaderDatagrid/__clientcode_enter()[C:\Users\Robbyn\Adobe Flash Builder 4.7\pressmindv1.1\src\ItemRenderer\Datagrid\GlobalHeaderDatagrid.mxml:477]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/framework/src/mx/core/UIComponent.as:13160]
at spark.components.supportClasses::SkinnableTextBase/textDisplay_enterHandler()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/spark/src/spark/components/supportClasses/SkinnableTextBase.as:2736]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/framework/src/mx/core/UIComponent.as:13160]
at spark.components::RichEditableText/http://www.adobe.com/2006/flex/mx/internal::keyDownHandler()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/spark/src/spark/components/RichEditableText.as:4337]
at spark.components.supportClasses::RichEditableTextContainerManager/keyDownHandler()[/Users/justinmclean/Documents/ApacheFlexSDK/frameworks/projects/spark/src/spark/components/supportClasses/RichEditableTextContainerManager.as:660]