vbs script upload only the file name without inside data - file-upload

Question

The problem of this script is that it shows an unknown error Message while running the script.
I called the function by echo method in my ftp which is "filezilla".
every thing is working fine as it logs into the server check for the path, open channel for data writing. Still dont know where is the problem
Function FTPUpload(sSite, sUsername, sPassword, sLocalFile, sRemotePath)
'This script is provided under the Creative Commons license located
'at http://creativecommons.org/licenses/by-nc/2.5/ . It may not
'be used for commercial purposes with out the expressed written consent
'of NateRice.com
Const OpenAsDefault = -2
Const FailIfNotExist = 0
Const ForReading = 1
Const ForWriting = 2
Set oFTPScriptFSO = CreateObject("Scripting.FileSystemObject")
Set oFTPScriptShell = CreateObject("WScript.Shell")
sRemotePath = Trim(sRemotePath)
sLocalFile = Trim(sLocalFile)
'----------Path Checks---------
'Here we willcheck the path, if it contains
'spaces then we need to add quotes to ensure
'it parses correctly.
If InStr(sRemotePath, " ") > 0 Then
If Left(sRemotePath, 1) <> """" And Right(sRemotePath, 1) <> """" Then
sRemotePath = """" & sRemotePath & """"
End If
End If
If InStr(sLocalFile, " ") > 0 Then
If Left(sLocalFile, 1) <> """" And Right(sLocalFile, 1) <> """" Then
sLocalFile = """" & sLocalFile & """"
End If
End If
'Check to ensure that a remote path was
'passed. If it's blank then pass a "\"
If Len(sRemotePath) = 0 Then
'Please note that no premptive checking of the
'remote path is done. If it does not exist for some
'reason. Unexpected results may occur.
sRemotePath = "\"
End If
'Check the local path and file to ensure
'that either the a file that exists was
'passed or a wildcard was passed.
If InStr(sLocalFile, "*") Then
If InStr(sLocalFile, " ") Then
FTPUpload = "Error: Wildcard uploads do not work if the path contains a " & _
"space." & vbCRLF
FTPUpload = FTPUpload & "This is a limitation of the Microsoft FTP client."
Exit Function
End If
ElseIf Len(sLocalFile) = 0 Or Not oFTPScriptFSO.FileExists(sLocalFile) Then
'nothing to upload
FTPUpload = "Error: File Not Found."
Exit Function
End If
'--------END Path Checks---------
'build input file for ftp command
sFTPScript = sFTPScript & "USER " & sUsername & vbCRLF
sFTPScript = sFTPScript & sPassword & vbCRLF
sFTPScript = sFTPScript & "cd " & sRemotePath & vbCRLF
sFTPScript = sFTPScript & "binary" & vbCRLF
sFTPScript = sFTPScript & "prompt n" & vbCRLF
sFTPScript = sFTPScript & "put " & sLocalFile & vbCRLF
sFTPScript = sFTPScript & "quit" & vbCRLF & "quit" & vbCRLF & "quit" & vbCRLF
sFTPTemp = oFTPScriptShell.ExpandEnvironmentStrings("%TEMP%")
sFTPTempFile = sFTPTemp & "\" & oFTPScriptFSO.GetTempName
sFTPResults = sFTPTemp & "\" & oFTPScriptFSO.GetTempName
'Write the input file for the ftp command
'to a temporary file.
Set fFTPScript = oFTPScriptFSO.CreateTextFile(sFTPTempFile, True)
fFTPScript.WriteLine(sFTPScript)
fFTPScript.Close
Set fFTPScript = Nothing
oFTPScriptShell.Run "%comspec% /c FTP -n -s:" & sFTPTempFile & " " & sSite & _
" > " & sFTPResults, 0, TRUE
Wscript.Sleep 1000
'Check results of transfer.
Set fFTPResults = oFTPScriptFSO.OpenTextFile(sFTPResults, ForReading, _
FailIfNotExist, OpenAsDefault)
sResults = fFTPResults.ReadAll
fFTPResults.Close
oFTPScriptFSO.DeleteFile(sFTPTempFile)
oFTPScriptFSO.DeleteFile (sFTPResults)
If InStr(sResults, "226 Transfer complete.") > 0 Then
FTPUpload = True
ElseIf InStr(sResults, "File not found") > 0 Then
FTPUpload = "Error: File Not Found"
ElseIf InStr(sResults, "cannot log in.") > 0 Then
FTPUpload = "Error: Login Failed."
Else
FTPUpload = "Error: Unknown."
End If
Set oFTPScriptFSO = Nothing
Set oFTPScriptShell = Nothing
WScript.Echo "Process Completed (" & Now & ")"
End Function