Plugin Conflict

Hey guys,
Apparently I have this fatal error/plugin conflict between Edit Flow and Visualizer plugin (https://wordpress.org/plugins/visualizer/): https://prnt.sc/szx9ul
Can you help me out?

The page I need help with: [log in to see the link]