Error After Upgrading to WordPress 4.5.3

Hi,

I've had an issue with my site http://www.explainervideocost.com, it was working fine when it was running on WordPress 4.5.2, After upgrading to WordPress 4.5.3 my site is not functioning how it should on the front-end.

I urgently need a fix, so if you have any ideas of how I can fix this, that'd be much appreciated.

Thanks,

-Steve