Url error

I try to install and register and the plugin redirect me to this url

https://admin.rublon.com/?error=error&error_msg=ERROR_CODE%3A+INVALID_INITIAL_PARAMETERS&action=final_error

and the page show me a QR code

what to do?

https://wordpress.org/plugins/rublon/