Does not work | не работает как надо

Just after installing, the admin dashboard does not work (any admin page). The only phrase displays:

Fatal error: Call to undefined function ThemeisleSDK\Modules\get_user_locale() in /wp-content/plugins/wp-product-review/vendor/codeinwp/themeisle-sdk/src/Modules/Translate.php on line 786.

changed “return get_user_locale();” to “return true;” and the plugin (and site dashboard) started to work again.

Also, the review form (“write a review”) does not appear on the pages after adding the [P_REVIEW] shortcode. Deactivated & uninstalled.