Android Question List.RemoveAt Problem

Hey all,

Dim filelist As List
Dim strAux As String

filelist = File.ListFiles(File.DirInternal)

For i = 0 To filelist.Size - 1

strAux = filelist.Get(i)
If strAux.IndexOf(".png") < 0 Then
filelist.RemoveAt(i+1)
End If

Next

In the code above when execute filelist.RemoveAt(i+1) i get this error java.lang.UnsupportedOperation Exception.

I can not understand what is happening.

Please help.

Thank you