Error when a DataGrid is edited

Hi,
I set my app DataGrid to editable to true. But when I double click to edit a cell, a Flash Player error occur :
TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at spark.accessibility::DataGridAccImpl/makeRowString()[E:\dev\4.5.1\frameworks\projects\spa rk\src\spark\accessibility\DataGridAccImpl.as:1068]
    at spark.accessibility::DataGridAccImpl/eventHandler()[E:\dev\4.5.1\frameworks\projects\spar k\src\spark\accessibility\DataGridAccImpl.as:1031]
    at flash.events::EventDispatcher/dispatchEventFunction()
    at flash.events::EventDispatcher/dispatchEvent()
    at mx.core::UIComponent/dispatchEvent()[E:\dev\4.5.1\frameworks\projects\framework\src\mx\co re\UIComponent.as:13128]
    at spark.components.gridClasses::DataGridEditor/setEditedItemPosition()[E:\dev\4.5.1\framewo rks\projects\spark\src\spark\components\gridClasses\DataGridEditor.as:315]
    at spark.components.gridClasses::DataGridEditor/dataGrid_gridItemEditorSessionStartingHandle r()[E:\dev\4.5.1\frameworks\projects\spark\src\spark\components\gridClasses\DataGridEditor .as:1204]
    at flash.events::EventDispatcher/dispatchEventFunction()
    at flash.events::EventDispatcher/dispatchEvent()
    at mx.core::UIComponent/dispatchEvent()[E:\dev\4.5.1\frameworks\projects\framework\src\mx\co re\UIComponent.as:13128]
    at spark.components.gridClasses::DataGridEditor/startItemEditorSession()[E:\dev\4.5.1\framew orks\projects\spark\src\spark\components\gridClasses\DataGridEditor.as:798]
    at spark.components::DataGrid/startItemEditorSession()[E:\dev\4.5.1\frameworks\projects\spar k\src\spark\components\DataGrid.as:3803]
    at spark.components.gridClasses::DataGridEditor/grid_gridMouseUpHandler()[E:\dev\4.5.1\frame works\projects\spark\src\spark\components\gridClasses\DataGridEditor.as:1379]
    at flash.events::EventDispatcher/dispatchEventFunction()
    at flash.events::EventDispatcher/dispatchEvent()
    at mx.core::UIComponent/dispatchEvent()[E:\dev\4.5.1\frameworks\projects\framework\src\mx\co re\UIComponent.as:13128]
    at spark.components::Grid/dispatchGridEvent()[E:\dev\4.5.1\frameworks\projects\spark\src\spa rk\components\Grid.as:4038]
    at spark.components::Grid/grid_mouseDownDragUpHandler()[E:\dev\4.5.1\frameworks\projects\spa rk\src\spark\components\Grid.as:3883]
    at Function/<anonymous>()[E:\dev\4.5.1\frameworks\projects\spark\src\spark\utils\MouseEventU til.as:96]
I tried to put the DataGrid in a very simple new project and there is no error.
Here is the code :
<s:DataGrid id="dgProperties" width="100%" height="100%" editable="true"
        sortableColumns="false">
        <s:ArrayCollection>
                <s:DataItem key="1000" name="Abrasive" price="100.11" call="false"/>
                <s:DataItem key="1001" name="Brush" price="110.01" call="true"/>
                <s:DataItem key="1002" name="Clamp" price="120.02" call="false"/>
                <s:DataItem key="1003" name="Drill" price="130.03" call="true"/>
                <s:DataItem key="1004" name="Epoxy" price="140.04" call="false"/>
                <s:DataItem key="1005" name="File" price="150.05" call="true"/>
                <s:DataItem key="1006" name="Gouge" price="160.06" call="false"/>
                <s:DataItem key="1007" name="Hook" price="170.07" call="true"/>
                <s:DataItem key="1008" name="Ink" price="180.08" call="false"/>
                <s:DataItem key="1009" name="Jack" price="190.09" call="true"/>
            </s:ArrayCollection>
        <s:columns>
            <s:ArrayList>
                <s:GridColumn headerText="name" dataField="name"/>
                <s:GridColumn headerText="price" dataField="price"/>
            </s:ArrayList>
        </s:columns>
    </s:DataGrid>
Thx.

I have same problem.
TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at spark.accessibility::DataGridAccImpl/makeRowString()[E:\dev\4.5.1\frameworks\projects\spa rk\src\spark\accessibility\DataGridAccImpl.as:1068]
    at spark.accessibility::DataGridAccImpl/eventHandler()[E:\dev\4.5.1\frameworks\projects\spar k\src\spark\accessibility\DataGridAccImpl.as:1031]
    at flash.events::EventDispatcher/dispatchEventFunction()
    at flash.events::EventDispatcher/dispatchEvent()
    at mx.core::UIComponent/dispatchEvent()[E:\dev\4.5.1\frameworks\projects\framework\src\mx\co re\UIComponent.as:13128]
    at spark.components.gridClasses::DataGridEditor/setEditedItemPosition()[E:\dev\4.5.1\framewo rks\projects\spark\src\spark\components\gridClasses\DataGridEditor.as:315]
    at spark.components.gridClasses::DataGridEditor/dataGrid_gridItemEditorSessionStartingHandle r()[E:\dev\4.5.1\frameworks\projects\spark\src\spark\components\gridClasses\DataGridEditor .as:1204]
    at flash.events::EventDispatcher/dispatchEventFunction()
    at flash.events::EventDispatcher/dispatchEvent()
    at mx.core::UIComponent/dispatchEvent()[E:\dev\4.5.1\frameworks\projects\framework\src\mx\co re\UIComponent.as:13128]
    at spark.components.gridClasses::DataGridEditor/startItemEditorSession()[E:\dev\4.5.1\framew orks\projects\spark\src\spark\components\gridClasses\DataGridEditor.as:798]
    at spark.components::DataGrid/startItemEditorSession()[E:\dev\4.5.1\frameworks\projects\spar k\src\spark\components\DataGrid.as:3803]
    at spark.components.gridClasses::DataGridEditor/doubleClickTimerHandler()[E:\dev\4.5.1\frame works\projects\spark\src\spark\components\gridClasses\DataGridEditor.as:1428]
    at flash.utils::Timer/_timerDispatch()
    at flash.utils::Timer/tick()
In the class DataGridAccImpl, line 1068: "rowString = rowString.replace("%1", dgAccInfo.reachableRowIndex + 1).replace("%2", dgAccInfo.reachableRowCount);". rowString is null.
After app initialized i call ResourceManager.getInstance().localeChain = [language]; (language = "fr_FR"). I tried "fr" "en_US" "pt_BR".. Same problem.
This problem is only in AIR project.
Anyone already solved this problem?

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