Why do I get: "There is already an open datareader associated with this command which must be closed first"

I'm getting: "There is already an open datareader associated with this command which must be closed first"

Hi, I've got  a TabControl, with several TabPages, with RadGridViews in them.

I pretty much let the GUI do most of the wiring up of the grids & data..

Everything seems to be working except, I'm getting the Subject's message when I Add a new Row.

As soon as the row is added, I get the icon on the row, and that message.(I'm testing by using the  "ItemNumberChanges" tab)

The row adds just fine, and I can update it, & delete it as well.

The Add  function(by using the built-in "Click here to add a new row" fires off:

    Private Sub RadGridView_ItemNumberChanges_UserAddedRow(sender As Object, e As Telerik.WinControls.UI.GridViewRowEventArgs) Handles RadGridView_ItemNumberChanges.UserAddedRow
        Cribcrawl_Item_No_ChangesTableAdapter.Update(Me.ReportServerDataSet_Item_No_Changes)
    End Sub

From there, it goes to the:  ReportServerDataSet_Item_No_Changes.vb, and to:


       

Public Overloads Overridable Function Update(ByVal dataSet As ReportServerDataSet_Item_No_Changes) As Integer
            Return Me.Adapter.Update(dataSet, "cribcrawl_Item_No_Changes")
        End Function