[Solved] Copy texts from file and paste to WebBrowser

Sorry for the noobie question, but I'm planning to copy text from file to inputbox on web browser. I get error saying that I did not declare $sFile?

$sFile = FileOpen(@ScriptDir & "\config.txt")
$sRead = FileRead($sFile)

$aString = StringSplit($sRead, @CRLF, 1)

If $aString[0] < 11 Then Exit

$sResult = ""

For $i = 11 To $aString[0]
    $sResult &=$aString[$i] & @CRLF
Next
 
WinActivate($Title)
FileWrite($Title, $sResult)
 

Isn't $sFile = FileOpen(@ScriptDir & "\config.txt") declaring it already?