I have a similar problem also not sure to open a new thread or use this one:
Warning: unlink(/home/dd/public_html/images/slides): Is a directory in /home/dd/public_html/webassist/file_manipulation/helperphp.php on line 763
Warning: Cannot modify header information - headers already sent by (output started at /home/dd/public_html/webassist/file_manipulation/helperphp.php:763) in /home/dd/public_html/admin/slides_detail.php on line 133
Warning: unlink(/home/dd/public_html/images/slides): Is a directory in /home/dd/public_html/webassist/file_manipulation/helperphp.php on line 763