Uncaught Error: Call to a member function

Hi.
While I am trying to make use of this plugin on my multisite. I think it is not fully multisite compatible. I am getting these errors right away on a full white page and I have wp debug enabled with wp debug display off and log to true.

Please see the errors here: https://pastebin.com/67UvULry

Please suggest what can I do to resolve these errors and apply changes to my website using this plugin? Because, due to this error the changes are also not being saved.