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Hello @mkp1981,
According to the error, the built-in Rest API of the application does not work as expected. The API in question is required by our plugin. Please check the displayed error messages in order to find the possible reasons for the issue.
If your website is hosted on our end, please post a new ticket from your SiteGround User Area and we will be glad to assist. If not, you should check your .htaccess file for any blocking directives, the installed security-related plugins and ensure that the WordPress core along with all plugins and themes are the latest versions.
Best Regards,
Dimitar Petrov