Critical error on your website this plugin….

I have experimented the same problems that @flavinho

this plugin is perfect, congratulations to the creator.
but i have a problem .. i have the updated version of WordPress updated today 12 / april / 2020,
when I click “add new role”, I create normally.
However, when I click on “settings” or “functions”, this message appears: “There is a critical error on your website. Check your email for instructions.”
Note: I have already deactivated and activated this plugin, uninstalled and installed again.
but the error still continues! some help?