upload files not working

[aragorn_reborn]

I am creating a custom page on my vBulletin installation. The page will allow users to upload files. I am using the vBulletin system for the same. The code that i used for the same is given below. I get this error when i try to upload any file

Warning: move_uploaded_file(Uploads/index.html ): failed to open stream: No such file or directory in /usr/local/share/doc/vhost/mydomain.org/httpdocs/screen/index.php on line 84

Warning: move_uploaded_file(): Unable to move '/users/mydomain.org/tmp/phpsj0NMr' to 'Uploads/index.html ' in /usr/local/share/doc/vhost/mydomain.org/httpdocs/screen/index.php on line 84

Its not a directory permissions issue because the uploads work fine when i use a upload php script without using the vbulletin base. Here is the code i used.

if ($_REQUEST["do"] != "") {
	
		$vbulletin->input->clean_array_gpc('f', array(
			'attachfile' => TYPE_FILE
		));
			
		$target_path = "Uploads/";
		$filename = $vbulletin->GPC['attachfile']['name'];
		$target_path = $target_path . $filename; 
		if (move_uploaded_file($vbulletin->GPC['attachfile']['tmp_name'], $target_path))
		{
			//Yay! File Upload was successful
			echo "File upload successful";
         	}

I am stuck with this for the last one week. Kindly help...

Thanks in advance.

There is a upload class in vBulletin. Is that of some help?

I have to use the interface to upload pdf files of upto 2 Mb.