Visual Composer: Fatal error: Call to undefined function vc_column_offset_class_

I recently updated the Highend theme and WordPress to their latest versions and it appears Visual Composer is broken. I’m currently unable to update Visual Composer.

I have noted the following error on my page:

Fatal error: Call to undefined function vc_column_offset_class_merge()

Is there a workaround to manually deactive and install the latest version of Visual Composer? Have I lost all of my content that is no longer being displayed?

Please see http://www.dozaster.com for reference.