I Cant Figure Out Why This Update Isnt Working

 i dont know if it is just because im tired or what. im trying to do a update one this table here is the stored procedure im usingALTER PROCEDURE Snake.UpdateSPlits
@name nvarchar(50),
@split nvarchar(50)
AS
Update accounts
Set split_id = @split
Where name = @name

RETURN Here is what im using to call it  Protected Sub GridView1_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles GridView1.RowUpdating
Me.SqlDataSource1.UpdateParameters.Clear()

Dim name As String = Me.GridView1.SelectedRow.Cells(0).Text
Dim Split As String = Me.GridView1.SelectedRow.Cells(1).Text

Dim pname As New Parameter("name", TypeCode.String, name)
Me.SqlDataSource1.UpdateParameters.Add(pname)

Dim psplit As New Parameter("split", TypeCode.String, Split)
Me.SqlDataSource1.UpdateParameters.Add(psplit)

Me.SqlDataSource1.Update()
End Sub  I keep getting one of 2 errors they are
Object reference not set to an instance of an object. or
one that says i had to many aurgements
 
any idea what im doing wrong?