error on FTP file uploading in c#

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WPF

C#3.5

Error- Configuration system failed to initialize

I got error on FtpWebRequest.Create(uri)

FileInfo fileInf = new FileInfo(FileName);
string uri = "ftp://" + ftpServerIP + "//";// +fileInf.Name;
FtpWebRequest reqFTP;

// Create FtpWebRequest object from the Uri provided
reqFTP = (FtpWebRequest)FtpWebRequest.Create(uri);

// Provide the WebPermission Credintials
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

// By default KeepAlive is true, where the control connection is
// not closed after a command is executed.
reqFTP.KeepAlive = false;

// Specify the command to be executed.
reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

// Uploding work .....


How to resolve this problem