PHP errors and VERY slow backend access after WordPress update to 4.0 version

Hi,

Im getting the following PHP errors for the website using your theme:

[Tue Oct 28 08:39:54 2014] [error] [client 198.45.26.29] PHP Warning: include() [function.include]: Filename cannot be empty in /nas/wp/www/cluster-1754/capsulas/wp-content/plugins/ishyoboy-boldial-assets/ishyoboy-shortcodes/ishyoboy-shortcodes.php on line 661, referer: https://capsula.co.il/wp-admin/post.php?post=3612&action=edit&message=6

[Tue Oct 28 08:39:54 2014] [error] [client 198.45.26.29] PHP Warning: include() [function.include]: Failed opening ” for inclusion (include_path=’.:/usr/share/php:/usr/share/pear’) in /nas/wp/www/cluster-1754/capsulas/wp-content/plugins/ishyoboy-boldial-assets/ishyoboy-shortcodes/ishyoboy-shortcodes.php on line 661, referer: https://capsula.co.il/wp-admin/post.php?post=3612&action=edit&message=6

In addition, the backend is very slow to work with.
Can you please explain what could be the issue?

Thanks!