class system.data.dataset cannot be indexed because it has no default property

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VB

Hi All,

I am running into the above error and i am struggling to understand why this is coming up as i know this code was working previously. I am sure i haven't changed anything in this code but i was hoping someone could advise me where i am going wrong.

Public Sub systemsList()

    Dim dt1 As New DataTable

    dt1 = GetUserName.sysTableData(Session("User")).ToString

    For x = 0 To dt1.Rows.Count - 1
        systemL.Items.Add(dt1(x).ToString)
    Next

    If Page.IsPostBack = False Then

        Dim testData As New DataSet
        testData = sysTableData()

        systemL.DataSource = testData
        systemL.DataValueField = "description"
        systemL.DataTextField = "description"
        systemL.DataBind()

    End If

End Sub