php uploadify ฟ้อง PHP Warning : move_upload_file

if (!empty($_FILES)) {
	$new =date('ymd');
	$tempFile = $_FILES['Filedata']['tmp_name'];
	$targetPath = $_SERVER['DOCUMENT_ROOT'] . $_REQUEST['folder'] . '/';
	$targetFile =  str_replace('//','/',$targetPath) ."$new".strtr($_FILES['Filedata']['name'],"#","_")
        
        move_uploaded_file($tempFile,$targetFile);
	echo str_replace($_SERVER['DOCUMENT_ROOT'],'',$targetFile);
}