Pagination not working

Hi I am working with enfold theme masonary gallery. I have activated paginated on this but it’s not working. Here’s the link to my problem.

If you scroll down to past exhibitions. You can see two rows of events instead of one with the pagination. How to fix this ?

Other than this when I try to update the home page via admin panel it redirects me to this url
http://farahjanjuaphotography.com/wp-admin/post.php
with the following error
Notice: Undefined index: index in /hermes/bosnacweb04/bosnacweb04az/b1694/ipg.farahjanjua16368/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_gallery.php on line 450 Notice: Undefined index: index in /hermes/bosnacweb04/bosnacweb04az/b1694/ipg.farahjanjua16368/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_gallery.php on line 453 Notice: Undefined index: index in /hermes/bosnacweb04/bosnacweb04az/b1694/ipg.farahjanjua16368/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_gallery.php on line 454 Notice: Undefined index: index in /hermes/bosnacweb04/bosnacweb04az/b1694/ipg.farahjanjua16368/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_gallery.php on line 450 Notice: Undefined index: index in /hermes/bosnacweb04/bosnacweb04az/b1694/ipg.farahjanjua16368/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_gallery.php on line 453 Notice: Undefined index: index in /hermes/bosnacweb04/bosnacweb04az/b1694/ipg.farahjanjua16368/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_gallery.php on line 454 Warning: Cannot modify header information – headers already sent by (output started at /hermes/bosnacweb04/bosnacweb04az/b1694/ipg.farahjanjua16368/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_gallery.php:450) in /hermes/bosnacweb04/bosnacweb04az/b1694/ipg.farahjanjua16368/wp-admin/post.php on line 198 Warning: Cannot modify header information – headers already sent by (output started at /hermes/bosnacweb04/bosnacweb04az/b1694/ipg.farahjanjua16368/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_gallery.php:450) in /hermes/bosnacweb04/bosnacweb04az/b1694/ipg.farahjanjua16368/wp-includes/pluggable.php on line 1219