Format Exception Unhandled

[Cr1pDawg]

When I run this program I get a Format Exception was Unhandled Input String Format was not a correct format. It happens at the 2nd Listbox1.text line when I have the Sting formatted Anyone have any ideas

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim Pop As IO.StreamReader = IO.File.OpenText("populationdata.txt")
        Dim Group As String
        Dim Male, Female, Total, Male2, Female2, Total2 As Double
        Dim Total3 As Double
        Dim fmtstng As String = "{0,-15} {1,14} {2,13} (3,12:p} {4,11:p} {5,10:p}"
 
        Group = Pop.ReadLine
        Total += CDbl(Pop.ReadLine)
        Total += CDbl(Pop.ReadLine)
        Group = Pop.ReadLine
        Total += CDbl(Pop.ReadLine)
        Total += CDbl(Pop.ReadLine)
        Group = Pop.ReadLine
        Total += CDbl(Pop.ReadLine)
        Total += CDbl(Pop.ReadLine)
        Pop.Close()
        ListBox1.Items.Add("Age Group    Females     %Males   %Females   %Total")
        Pop = IO.File.OpenText("populationdata.txt")
        Group = Pop.ReadLine
        Male = CDbl(Pop.ReadLine)
        Female = CDbl(Pop.ReadLine)
        Total2 = Male + Female
        Male2 = Male / Total2 * 100
        Female2 = Female / Total2 * 100
        Total3 = Total2 / Total * 100
        ListBox1.Items.Add(String.Format(fmtstng, Group, Male, Female, Male2, Female2, Total3)):wave:  This is where I have the issue 
        Group = Pop.ReadLine
        Male = CDbl(Pop.ReadLine)
        Female = CDbl(Pop.ReadLine)
        Total2 = Male + Female
        Male2 = Male / Total2 * 100
        Female2 = Female / Total2 * 100
        Total3 = Total2 / Total * 100
        ListBox1.Items.Add(String.Format(fmtstng, Group, Male, Female, Male2, Female2, Total3))
        Group = Pop.ReadLine
        Male = CDbl(Pop.ReadLine)
        Female = CDbl(Pop.ReadLine)
        Total2 = Male + Female
        Male2 = Male / Total2 * 100
        Female2 = Female / Total2 * 100
        Total3 = Total2 / Total * 100
        ListBox1.Items.Add(String.Format(fmtstng, Group, Male, Female, Male2, Female2, Total3))
        Pop.Close()