I installed WpDiscuz a while ago, and am only now starting to use it.  

I'm on WP 5.5.1, or whatever the latest version is.  Everything is up to date.

Only when I click on Settings for the plugin, I'm told "Cannot load wp_discuz options page."  

I have no idea how to fix this.  I'm fairly tech-savvy, but without any error messages or diagnostics, I'm at a loss.

I've attached a screenshot of the error.

Any ideas?