Error with Ninja Forms after upgrading web server

This website was moved to a different server and then the form created using the Ninja Forms plug-in stopped working. The site was on a CloudLinux6.8 server and now it’s on Centos7.8.

This is the error the form produces:

The server encountered an error during processing.
Call to undefined method NF_Abstracts_ModelFactory::get_settings()

I just updated WordPress and PHP and Ninja Forms, but now there are many errors on the site.

Any assistance would be appreciated.

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

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