You need to elaborate. This is a bit like calling a doctor and saying: “I don’t feel well. What’s wrong with me?” 8)
Seriously though, asking questions require some thought. You have to consider what information other people needs in order to answer your question. For this subject: 1) What kind of file are you reading; 2) What’s “wrong” with your flow – What did you expect the flow to do, and what happened; 3) Is the FTP server remote or on a LAN? So on… Please give us something to ponder.