I get an error when trying to process a BatchUpdate on a grid.  I click on the "Accept All Changes" and see the indictor saying "Submitting all changes to server...".  Then an unhandled exception pops up with "Unable to communicate with server".

Any ideas?

<LayoutSettings AllowAddNew="No" AllowColumnSizing="Yes" AllowColumnMove="Yes" AllowDelete="No"
                AllowEdit="Yes" AllowExport="Yes" AllowFilter="Yes" AllowGrouping="No" AllowSelectColumns="Yes"
                AllowSorting="Yes" GridLineColor="#CCCCCC" GridLines="Both" GridLineStyle="Solid"
                PagingMode="ClassicPaging" PagingSize="500" AllowBatchUpdate="true" PagingStyleUI="FirstPrevNextLast"
                AllowMultipleSelection="Yes" GroupByBoxVisible="false" HeaderClickAction="SortMulti"
                VerboseEditingInformation="true" NewRowLostFocusAction="AlwaysUpdate" FocusNewRowOnLastCell="true"
                AllowColumnFreezing="Yes" ApplyFiltersKey="Enter" EditOnClick="True" 
                AutoWidth="True" AutoFilterSuggestion="true" PagingExportMode="ExportCurrentPageView" 
                InProgressUIBehavior="ChangeCursorToHourGlass">
                <FreezePaneSettings ShowInContextMenu="true" MaxFrozenColumns="6" />
                <EditFocusCellStyle BackColor="#E9CD82">
                </EditFocusCellStyle>          
                <EditTextboxStyle BorderStyle="None" BorderWidth="0px" Font-Names="Arial" Font-Size="8pt">
                </EditTextboxStyle>
                <BatchUpdateSettings AllowReviewChanges="True" HighlightChanges="true" PromptUnsavedChanges="true" />
                <FrameStyle BackColor="#f2f2f2">
                </FrameStyle>
                <GroupByBox>
                    <Style BackColor="#f2f2f2">
                        </Style>
                    <LabelStyle BackColor="White" BorderColor="#CCCCCC" BorderStyle="Solid" BorderWidth="1px"
                        Font-Names="Arial" Font-Size="8pt" />
                </GroupByBox>
                <GroupRowInfoStyle BackgroundImage="/CommonLibrary/Images/ColBk.gif" BorderColor="#CCCCCC"
                    BorderStyle="None" Font-Names="Arial" Font-Size="8pt">
                </GroupRowInfoStyle>
                <AlternatingRowStyle BackColor="#FFFFFF" ForeColor="#666666" Font-Names="Arial" Font-Size="11px"
                    Padding-Left="10px" Padding-Right="10px" Wrap="true">
                    <Padding Left="10px" Right="10px"></Padding>
                </AlternatingRowStyle>
                <RowStyle BackColor="#f2f2f2" ForeColor="#666666" Font-Size="11px" CustomRules="text-overflow: ellipsis; overflow-x: hidden"
                    Font-Names="Arial" Height="20px" Padding-Left="10px" Padding-Right="10px" Wrap="true">
                    <Padding Left="10px" Right="10px"></Padding>
                </RowStyle>
                <SelectedRowStyle BackColor="#dadada" />
                <%-- <FocusCellStyle BorderColor="#CCCCCC" BorderStyle="Solid" 
                    BorderWidth="1px" />  --%>
                <HeaderStyle BackColor="#0078AE" Font-Bold="true" BorderColor="#CCCCCC" BorderStyle="Solid"
                    BorderWidth="1px" CustomRules="border-bottom: #73A1E4 1px solid" Font-Names="Arial"
                    Font-Size="11px" ForeColor="#FFFFFF" Height="20px" Padding-Left="10px" Padding-Right="10px">
                    <Padding Left="10px" Right="10px"></Padding>
                </HeaderStyle>
                <NewRowStyle BackColor="White" Font-Names="Arial" Font-Size="11px" ForeColor="#666666">
                </NewRowStyle>
                <FooterStyle BackColor="#E9CD82" Font-Names="Arial" Font-Size="11px" ForeColor="#666666" />
                <StatusBarStyle BackColor="#f2f2f2" BorderColor="#CCCCCC" BorderStyle="Solid" BorderWidth="1px"
                    Font-Names="Arial" Font-Size="8pt">
                    <Padding Bottom="2px" Left="2px" Right="2px" Top="2px" />
                </StatusBarStyle>
                <StatusBarCommandStyle>
                    <Normal>
                        <Padding Bottom="1px" Left="1px" Right="1px" Top="1px" />
                    </Normal>
                    <Over BackColor="#f2f2f2" BorderColor="#CCCCCC" BorderStyle="Solid" BorderWidth="1px">
                    </Over>
                    <Active BackColor="#f2f2f2" BaseStyle="Over">
                    </Active>
                </StatusBarCommandStyle>
                <HyperlinkStyle ForeColor="#0078AE" CustomRules="text-decoration: none;border-bottom: dotted 1px #DAE7F2; " />
                <DeletedRowStyle Font-Strikeout="true" ForeColor="Black">
                </DeletedRowStyle>
                <AddedRowStyle Font-Bold="true" ForeColor="Black" > </AddedRowStyle>                              
                <FilterRowStyle Wrap="false"></FilterRowStyle>
            </LayoutSettings>