Your site is experiencing a technical problem

hello good time. I downloaded the Job Board Manager plugin and installed and activated it on my site. And after setting the pages, when I wanted to create a job. The site gave me an error message. And that is the message. Your site is experiencing a technical problem. Dear friend, I might ask you to fix the plugin problem. To work easily on the site. I updated WordPress. And my WordPress has the latest version. And it should be noted that in the description of your plugin, it displays this message. Warning: This plugin has not been tested with the current version of your WordPress. Please send the answer to my Gmail. This is also my Gmail. Mohammad1bater12007@gmail.com