Fatal Error on new blog

I recently went “live” with my journalism portfolio blog. It was up and running for the past week, but today I am getting a fatal error message and I cannot even get into my dashboard to see what’s going on. It says this:

Fatal error: Call to undefined function portfolio_gallery_isset_table_column() in /home1/miranda/public_html/mirandaspenceraltice.com/wp-content/plugins/portfolio-gallery/includes/class-portfolio-gallery-install.php on line 52

Suggestions?

thanks,
Miranda