wp_handle_upload – The uploaded file could not be moved to wp-content/uploads/20

This is the code I am using to upload the file to WordPress

require $_SERVER['DOCUMENT_ROOT'] . "/wp-load.php";
    require $_SERVER['DOCUMENT_ROOT'] . "/wp-admin/includes/file.php";

    define(‘WP_DEBUG’, true);

    $filename = "test.png";
    $tmpFile = download_url("https://url.com/testing/crop/".$filename);

    chmod($tmpFile, 0755);

    $mimeType = wp_check_filetype($_SERVER['DOCUMENT_ROOT'] . '/testing/crop/'.$filename);
    $file_array = array(
    	'file' 		=> $_SERVER['DOCUMENT_ROOT'] . '/testing/crop/'.$filename,
    	'url' 		=> $_SERVER['DOCUMENT_ROOT'] . '/testing/crop/'.$filename,
    	'type' 		=> $mimeType['type'],
    	'size' 		=> filesize($_SERVER['DOCUMENT_ROOT'] . '/testing/crop/'.$filename),
    	'name' 		=> $filename,
    	'tmp_name' 	=> $tmpFile
    );

    $image = wp_handle_upload($file_array, array('test_form' => FALSE, 'test_upload' => FALSE, 'test_type' => FALSE));

    print_r($file_array);
    print_r($image);

    unlink($tmpFile);

This is the error I am getting “The uploaded file could not be moved to /home/xxxx/public_html/wp-content/uploads/2012/09.”

What I am trying to do is have a small PHP script outside of WordPress upload images to its Media Library and then post it however at this point I am getting stuck at the uploading stage.

All the permissions are correct as I am able to upload fine through the WordPress admin area.

Any help is much appreciated.