Android Question Error FTP Sent

Does anyone know why I can not send file via FTP?
I've done all the tests: on another system I can send the file exists, I can log in, the host folder exists. I just can not complete it because it always returns Sucess = False

Here's the code below:

FTP.UploadFile(File.DirInternal, "ORDER.TXT", True , "/FOLDER")
Wait For FTP_UploadCompleted (ServerPath As String, Success As Boolean)
If Success Then
Msgbox("Request sent successfully !!!","Ok")
ProgressDialogHide
Else
Msgbox("Order not shipped","Error")
ProgressDialogHide
End If