iOS Question ActivityViewController Error

Var.Filepath = xui.DefaultFolder
'********************************************************************************************************************
' Speichern
'********************************************************************************************************************
Public Sub Speichern
    Dim Out As OutputStream
    Out = File.OpenOutput(Var.Filepath, Var.ProjektName  & ".png", False)
    Var.ProjektPic.WriteToStream(Out, 100, "PNG")  [I][SIZE=3] [I]' var.projektPic  = B4XBitmap[/I][/SIZE][/I]
    Out.Close
 End Sub

[CODE=b4x] 
   Dim avc As ActivityViewController

         If File.Exists(Var.Filepath, Var.ProjektName  & ".png") Then
           [COLOR=rgb(235, 107, 86)] avc.Initialize("avc", Array(LoadBitmap(Var.Filepath,Var.ProjektName & ".png")))[/COLOR]
            avc.Show(B4XPages.GetNativeParent(Me), Root) 'Second parameter is relevant for iPad only. The arrow will point to the view.
            Wait For avc_Complete (Success As Boolean, ActivityType As String)
            Log($"Success: ${Success}, ActivityType: ${ActivityType}"$)
        End If