Android Question File not found in File.DirAssets

#Region Module Attributes
    #FullScreen: False
    #IncludeTitle: True
    #ApplicationLabel: Layers
    #VersionCode: 1
    #VersionName:
    #SupportedOrientations: unspecified
    #CanInstallToExternalStorage: True
    #DebuggerForceStandardAssets: true
#End Region

'Activity module
Sub Process_Globals
    Dim ProgName As String                    : ProgName = "Layers"
    Dim ProgVersion As String                : ProgVersion = "V 1.0"
    Dim TimerHorse As Timer
    Dim TimerBackground As Timer
    Dim TimerInterval As Long
End Sub

Sub Globals
    Dim ImageI As Int                                ' index of the current horse image
    Dim ImageDir As Int                            ' direction of the horse image
    Dim ImageNumber As Int                    ' number of horse images
        ImageNumber = 8
    Dim imgHorse(2, ImageNumber) As Bitmap        ' array horse image bitmaps
    Dim imvBackground As ImageView    ' background ImageView
    Dim imvForeground As ImageView    ' foreground ImageView
    Dim cvsForeground As Canvas            ' canvas for the foreground image
    Dim rectHorse As Rect                        ' rectangle of the horse image
    Dim HorseWidth As Int                        ' horse image width
    Dim HorseHeight As Int                    ' horse image height
    Dim HorseTop As Int                            ' horse image top
    Dim HorseLeft As Float                    ' current left position of the horse image
    Dim HorseDelta As Float                    ' horse move per timer tick
    Dim BackgroundLeft As Float            ' current left position of the background
    Dim BackgroundDelta As Float        ' background move per timer tick
End Sub

Sub Activity_Create(FirstTime As Boolean)
    Dim i As Int
    ' load the horse images
    ' first index = 0 for galloping to the right
    ' first index = 1 for galloping to the left
    For i = 0 To ImageNumber - 1
        [B]imgHorse(0, i).Initialize(File.DirAssets, "horse0" & i & ".png")
        imgHorse(1, i).Initialize(File.DirAssets, "horse1" & i & ".png"[/B])
    Next