Android Question java.lang.RuntimeException: Object should first be initialized (ListView)

[Majo03]

I have this error

java.lang.RuntimeException: Object should first be initialized (ListView).

in this sub

Sub Carga_BD_en_ListViewContactos
    ' Limpia el ListView1
    ListViewContactos_TEMJ.Clear
    ' Carga la tabla usuarios de la basedatos.sql
    registro = SQL1.ExecQuery("SELECT * FROM contactos")

    For n = 0 To registro.RowCount - 1
        registro.Position = n
        ListViewContactos_TEMJ.AddSingleLine(registro.GetString("id") & "|" & registro.GetString("nombre")& " - " & registro.GetString("telefono"))
        ListViewContactos_TEMJ.SingleLineLayout.ItemHeight = 40
        ListViewContactos_TEMJ.SingleLineLayout.Label.TextSize = 20
        ListViewContactos_TEMJ.SingleLineLayout.Label.TextColor = Colors.Black
        ListViewContactos_TEMJ.SingleLineLayout.Label.Color = Colors.White
    Next
End Sub

and these are my variables

Sub Globals
    'These global variables will be redeclared each time the activity is created
    Dim registro As Cursor
    Dim nombre, telefono As String
    Dim id As String

    Private btnIrAgenda_MJTE As Button
    Private txtNombre_TEMJ As EditText
    Private txtTelefono_TEMJ As EditText
    Private ListViewContactos_TEMJ As ListView
    Private btnAgregarContacto_TEMJ As Button
    Private btnBorarContacto_TEMJ As Button
End Sub

 

[Erel]

1. Never use ListView.
2. Always use B4XPages with new projects.
3. See this example: [B4X][B4XPages] SQL + xCLV Example