Flex mobile paged list troubles with destructionPolicy

Hello,
i have set a list with data paging in a flex mobile view with destructionPolicy=never, when coming back to this view i get some errors when the paging mechanism is triggered (there is no errors when all of the items were previously fetched).
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at mx.data::RPCDataServiceAdapter/http://www.adobe.com/2006/flex/mx/internal::addPagingParameters()[C:\depot\DataServices\br anches\milestone\lcds45_fb45\frameworks\projects\data\src\mx\data\RPCDataServiceAdapter.as :1108]
at mx.data::RPCDataServiceAdapter/pageQuery()[C:\depot\DataServices\branches\milestone\lcds4 5_fb45\frameworks\projects\data\src\mx\data\RPCDataServiceAdapter.as:411]
at mx.data::RPCDataServiceAdapter/processDataMessage()[C:\depot\DataServices\branches\milest one\lcds45_fb45\frameworks\projects\data\src\mx\data\RPCDataServiceAdapter.as:1069]
at RPCDataServiceRequest/invoke()[C:\depot\DataServices\branches\milestone\lcds45_fb45\frame works\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\milest one\lcds45_fb45\frameworks\projects\data\src\mx\data\DataStore.as:3497]
at Function/<anonymous>()[C:\depot\DataServices\branches\milestone\lcds45_fb45\frameworks\pr ojects\data\src\mx\data\DataStore.as:1716]
at mx.data::DataStore/http://www.adobe.com/2006/flex/mx/internal::fill()[C:\depot\DataServices\branches\mileston e\lcds45_fb45\frameworks\projects\data\src\mx\data\DataStore.as:1767]
at mx.data::DataStore/http://www.adobe.com/2006/flex/mx/internal::processPageRequest()[C:\depot\DataServices\bra nches\milestone\lcds45_fb45\frameworks\projects\data\src\mx\data\DataStore.as:1854]
at mx.data::ConcreteDataService/http://www.adobe.com/2006/flex/mx/internal::processPageRequest()[C:\depot\DataServices\bra nches\milestone\lcds45_fb45\frameworks\projects\data\src\mx\data\ConcreteDataService.as:50 35]
at mx.data::DataList/http://www.adobe.com/2006/flex/mx/internal::requestItemAt()[C:\depot\DataServices\branches \milestone\lcds45_fb45\frameworks\projects\data\src\mx\data\DataList.as:1201]
at mx.data::DataList/getItemAt()[C:\depot\DataServices\branches\milestone\lcds45_fb45\framew orks\projects\data\src\mx\data\DataList.as:364]
at mx.collections::ListCollectionView/getItemAt()[E:\dev\4.5.1\frameworks\projects\framework \src\mx\collections\ListCollectionView.as:511]
at mx.collections::AsyncListView/getItemAt()[E:\dev\4.5.1\frameworks\projects\framework\src\ mx\collections\AsyncListView.as:701]
at spark.components::DataGroup/getVirtualElementAt()[E:\dev\4.5.1\frameworks\projects\spark\ src\spark\components\DataGroup.as:1446]
at spark.layouts::VerticalLayout/updateDisplayListVirtual()[E:\dev\4.5.1\frameworks\projects \spark\src\spark\layouts\VerticalLayout.as:1807]
at spark.layouts::VerticalLayout/updateDisplayList()[E:\dev\4.5.1\frameworks\projects\spark\ src\spark\layouts\VerticalLayout.as:2105]
at spark.components.supportClasses::GroupBase/updateDisplayList()[E:\dev\4.5.1\frameworks\pr ojects\spark\src\spark\components\supportClasses\GroupBase.as:1294]
at spark.components::DataGroup/updateDisplayList()[E:\dev\4.5.1\frameworks\projects\spark\sr c\spark\components\DataGroup.as:1373]
at mx.core::UIComponent/validateDisplayList()[E:\dev\4.5.1\frameworks\projects\framework\src \mx\core\UIComponent.as:8989]
at mx.managers::LayoutManager/validateDisplayList()[E:\dev\4.5.1\frameworks\projects\framewo rk\src\mx\managers\LayoutManager.as:736]
at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\4.5.1\frameworks\projects\frame work\src\mx\managers\LayoutManager.as:819]
at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\4.5.1\frameworks\projec ts\framework\src\mx\managers\LayoutManager.as:1180]
at flash.utils::Timer/_timerDispatch()
at flash.utils::Timer/tick()
is there any way to prevent this ?

Nobody any idea?
i tried it like its described in this article:
Declaring file type associations
http://livedocs.adobe.com/flex/3/html/help.html?content=File_formats_1.html
but i can't get it running for my mobile project. The type associations works fine in my desktop air application but it doesn't work in my mobile app. Is this type associations stuff supposed to be working on mobile devices / android?

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