Upload file problem

I am having a problem using a upload file script.

[code=php]

function upload ($set){
$uploaddir = ‘../../_images/Sets/$set/’;
$uploadfile = $uploaddir . basename($_FILES[‘file’][‘name’]);
echo ‘<pre>’;
if (move_uploaded_file($_FILES[‘upfile’][‘tmp_name’], $uploadfile)) {
echo “File is valid, and was successfully uploaded.n”;
} else {
echo “Possible file upload attack!n”;
}
echo ‘Here is some more debugging info:’;
print_r($_FILES);
print “</pre>”;
}

[/code]

the error message reads

[CODE]

Possible file upload attack!
Here is some more debugging info:Array
(
[file] => Array
(
[name] => CTechLogo.gif
[type] => image/gif
[tmp_name] => /tmp/phpveJvur
[B] [error] => 0[/B]
[size] => 2930
)

)

[/CODE]

But i dont know what that meens

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