DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'LeadTime'

I have a web application written in C#.
I have added the following code to an Item Template in a DataGrid.

<%# ((Convert.ToInt32(DataBinder.Eval(Container.DataItem, "LeadTime"))) > 0) ? "+" + DataBinder.Eval(Container.DataItem, "LeadTime") : "&nbsp;"%> 

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I have modified the Stored Procedure to Include a Column called "LeadTime".
I have stepped throught the code but am unable to locate the source of this error:

DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'LeadTime'.

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I am at a loss. I do not know where to go from here.
Can someone assist in trouble shooting this error?

Here is a section of the code from the data grid on the aspx side.

		
<asp:TemplateColumn SortExpression="ModelNumber" HeaderText="Product&lt;br/&gt;Code">
			<HeaderStyle HorizontalAlign="Center"></HeaderStyle>
			<ItemStyle HorizontalAlign="Center" Width="100"></ItemStyle>
			<ItemTemplate>
			    <span class="leadtime">
				<%# ((Convert.ToInt32(DataBinder.Eval(Container.DataItem, "LeadTime"))) > 0) ? "+" + DataBinder.Eval(Container.DataItem, "LeadTime") : "&nbsp;"%> 
				</span> 
				<asp:label id="ProductID" runat="server" text='<%# DataBinder.Eval(Container.DataItem, "ProductID") %>' />
				&nbsp;<%# ((bool)DataBinder.Eval(Container.DataItem, "AdItem")) ? 
                  (DataBinder.Eval(Container.DataItem, "Quantity")==DBNull.Value || ((int)DataBinder.Eval(Container.DataItem, "Quantity"))<1) ? 
                    "<font color=red><b>$</b></font>" : "<font color=green><b>$</b></font>"
                  : "" %>
			</ItemTemplate>
		</asp:TemplateColumn>

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Something worth mentioning:
This app is an Online Ordering System. It contains two pages that use the same User Control and datagrid. The first page renders all products available and loads succesfully with the modification outlined above [LeadTime]. The second page is the Order [It contains all the products that the customer has added to their cart].

The cart page is the one that is causing the error.
But again, they use the same datagrid, but call different stored procedures.

Thanks for any insight you can give.
Jason