please help with zolak theme error

HI GUYS.

please help someone…i recently paid some designers abroad for a new website we chose a zolak theme..they gave me the admin details to edit my site..but i dont now what happend i checked my website and im getting this error on my gallery and blog
https://www.wonderstitches.com/portfolio-gallery/blinds/

it was working fine and i dont know whats happen..
Thanks for your help in advance