Streamwriter problem. It wont write anything to the file

It keeps telling me my file is being already being used, but it is creating it.

Here is my code:

 Sub Main()

        Dim sr = IO.File.OpenText("earnings.txt")
        Dim dataline() As String

        Do
            dataline = sr.readline.split(","c)

            Dim Plantcode = dataline(0).Trim
            Dim Deptnum = dataline(1).Trim
            Dim Empnum = dataline(2).Trim
            Dim Lname = dataline(3).Trim
            Dim Fname = dataline(4).Trim
            Dim Earnings = CDbl(dataline(5))
            Dim Ytdearnings = CDbl(dataline(6))
            Dim currentplant As String = Plantcode
            Dim plantearnings As Double
            Dim plantytdearnings As Double
            Dim sw As IO.StreamWriter = System.IO.File.CreateText("outputfile.txt")
            Dim reportearnings As Double
            Dim reportytdearnings As Double

            If Plantcode <> currentplant Then
                sw.WriteLine(plantearnings, plantytdearnings)
                currentplant = Plantcode
                plantearnings = Earnings
                plantytdearnings = Ytdearnings
                Printheadings(Plantcode)
            Else
                plantearnings += Earnings
                plantytdearnings += Ytdearnings
            End If
            reportearnings += Earnings
            reportytdearnings += Ytdearnings
            sw.WriteLine(" ")
            sw.WriteLine(String.Format("{0,-45}{1,11:C}{2,12:C}", _
            "PLANT TOTALS FOR " & currentplant, plantearnings, plantytdearnings))
            sw.WriteLine(" ")
            sw.WriteLine(" ")
        Loop Until sr.peek = -1

        sr.close()

    End Sub
    Sub Printheadings(ByVal plant As String)
        Dim sw As IO.StreamWriter

        sw.WriteLine("{0,-40}{1,15}", "MT MANUFACTURING", Now.ToShortDateString())
        Sw.writeline("PLANT EARNINGS REPORT")
        Sw.Writeline()
        If plant = "ATL" Then
            Sw.writeline("ATLANTIC PLANT")
        ElseIf plant = "CTL" Then
            Sw.writeline("CENTRAL PLANT")
        ElseIf plant = "MTN" Then
            Sw.Writeline("MOUNTAIN PLANT")
        Else
            Sw.writeline("PACIFIC PLANT")
        End If
        sw.WriteLine("")
        sw.WriteLine(String.Format("{0,-7}{1,-7}{2,-20}{3,-12}{4,11}{5,11}", _
        "PLANT", "DEPT", "EMP NUM", "NAME", "CUR EARN", "YEAR-T-D"))
        sw.WriteLine("")

    End Sub

End Module

Thanks