strange parse error

Hi.
I’m editing a template, called BlueGrey (download : https://www.skinpress.com/bluegrey-theme-2/ )
But I’ve a problem. when I edit index.php and run myblog, php said:
Parse error: parse error in C:\wamp\www\*******\wp-content\themes\BlueGrey\index.php on line 52

line 52 :: <?php endwhile; ?>

i pasted index.php (edited version) in pastebin:: https://pastebin.com/EMtxJN4h

note 1::: i have this problem on WAMP, and Xampp run it perfectly.
note 2::: original index.php has not any problem ::: https://pastebin.com/cmqJHqeh

Thanks.