TimeSpan.Parse Not Working When Processing CSV File

I am trying to upload tracks to my SQL database via a CSV file, but when I try to process the file, I get this exception:

System.FormatException
HResult=0x80131537
Message=String was not recognized as a valid TimeSpan.
Source=<Cannot evaluate the exception source>
StackTrace:
<Cannot evaluate the exception stack trace>

Neither formatting time as hh:mm:ss or h:mm:ss works, though my CSV is very simple; a record looks like this:

TrackName,TrackLength,TrackNumber,AlbumID
Elected,00:04:05,3,6

My code is also very simple; it has worked for converting numbers and DateTimes. What am I doing wrong with the TimeSpans? I've been Googling a lot, but all I've found says TimeSpan.Parse is the best method for converting strings to timespans.

Dim csvData = From line As String In File.ReadAllLines(filenameWithPath)
    Skip 1
    Let CR = line.Split(",")
    Select New Track With {
        .TrackName = CR(0),
        .TrackLength = TimeSpan.Parse(CR(1)),
        .TrackNumber = CInt(CR(2)),
        .AlbumID = CInt(CR(3))
    }

EDIT: There is no reason for an exception to be thrown. Below is the full code for my button click event; there's only a simple If statement to check if the file upload control has a file. Nothing here should be causing problems.

    Private Sub BTN_Upload_Click(sender As Object, e As EventArgs) Handles BTN_Upload.Click
        If FU_CSV.HasFile Then
            Dim filenameWithPath As String = Server.MapPath("~/Content/Docs/Data/" & FU_CSV.FileName)
            FU_CSV.SaveAs(filenameWithPath)
            Dim csvData = From line As String In File.ReadAllLines(filenameWithPath)
            Skip 1
            Let CR = line.Split(",")
            Select New Track With {
                .TrackName = CR(0),
                .TrackLength = TimeSpan.Parse(CR(1)),
                .TrackNumber = CInt(CR(2)),
                .AlbumID = CInt(CR(3))
            }

            For Each t As Track In csvData
                context.Tracks.Add(t)
                context.SaveChanges()
            Next
        End If
    End Sub