FtpResponse21: 550 The process cannot access the file because it is being used by another process. Chilkat FTP and FileZilla Server

I am using Chilkat FTP component to download some files from an FTP Server running FileZilla Server. Following is the error message when I try to do so.

ChilkatLog:
  GetFile:
    DllDate: Sep 10 2010
    UnlockPrefix: MYFTP
    Username: Admin
    Component: .NET 2.0
    localFilename: C:\Site\Code\Project\Station\project_station_r3.zip
    ModeZ: 0
    BinaryMode: 1
    Passive transfer mode
    hostAddr: 172.21.14.64
    DataConnect:
      hostname: 172.21.14.64
      port: 2487
      ConnectTimeoutMs: 60000
      myIP: 172.21.14.64
      myPort: 2488
      connect successful.
    PassiveDataConnectionSetupTimeMs: Elapsed time: 0 millisec
    RetrFilename: [/Site/Code/Project/Station/project_station_r3.zip]
    RETR failed
    Filename: /Site/Code/Project/Station/project_station_r3.zip
    FtpResponse21: 550 /Site/Code/Project/Station/project_station_r3.zip: The process cannot access the file because it is being used by another process.
    TotalTimeMs: Elapsed time: 15 millisec
    Failed.

The file is there, and I can download it manually using FileZilla FTP client. Can anybody tell me what is going on here?

Solution

Uh... is this FTP server on your local host? It sure looks it - myIP and hostname are the same. In that case, you're trying to write the same file over itself, roundabout through the loopback interface. The error you're getting is reasonably descriptive - FileZilla Server has the file open for reading, and you're trying to write to it.

Try storing to a different filename.