Object reference not set to an instance of an object.

[lisseth]

gracias, pero el problema se soluciono de esta forma:

Dim strStreamW As Stream
Dim strStreamWriter As StreamWriter
Dim FilePath As String

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click

FilePath = Server.MapPath("~/_administracion/deudas/errores/nombreArchivo.txt")

el problema era que declaraba 2 veces FilePath.

gracias por contestar.