Only When I Use A Grid View!!

hi, i have done some testing and its only when i put a grid view or any other type of data viewer on the page, and then connect it to the sql datasource that i get an error

 Line 1: Incorrect syntax near ')'.

now i really cant figure out what it is, here is the code i am using

SQL data source code :

asp:SqlDataSource ID="SQLDS_view_one_wish" runat="server" ConnectionString="<%$ ConnectionStrings:wishbank_DBCS %>"

SelectCommand="SELECT [msg], [Date_Time] FROM [tbl_MSG] WHERE (([Activated] = @Activated) AND ([msgID = @msgID]) )ORDER BY [Date_Time] DESC">

<SelectParameters>

<asp:Parameter DefaultValue="Y" Name="Activated" Type="String" />

<asp:SessionParameter Name="msgID" SessionField="sWV" Type="String" />

</SelectParameters>

</asp:SqlDataSource>

 

session variable code which sends it to this page

protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)

{

GridViewRow row = GridView1.SelectedRow;

Session["sWV"] = row.Cells[1].Text;

Response.Redirect("www/viewwf.aspx");

}

 

if you have an idea please let me know as im stuck!