Hi Nicolasprn,
Could you go to the setting page of the plugin: WordPress Settings / Google Reviews Widget / Setting, click by ‘DEBUG INFORMAITON’ button, copy the info and send it to [email protected]
I had the impression that the plugin did not create needed tables in WP database and you need to enable the option ‘Re-create the DB tables for the plugin (service option)’ on the Setting page, but to be sure I need to look the debug info.
Thanks!