Currency Symbol Error

Hello all my wearhouses are in the same country with only one currency. I’ve tryed flat and manual settings but every time I’m getting this error with the currency simbol. In this condition I can’t see my single product pages because I get a WP error.

[29-May-2020 20:49:49 UTC] PHP Fatal error:  Uncaught Error: Using $this when not in object context in wp-content/plugins/warehouse-popups-woocommerce/public/class-warehouse-popups-woocommerce-public.php:673
Stack trace:
#0 wp-includes/class-wp-hook.php(287): Warehouse_Popups_Woocommerce_Public::wh_popups_override_currency('ARS')
#1 wp-includes/plugin.php(206): WP_Hook->apply_filters('ARS', Array)
#2 wp-content/plugins/woocommerce/includes/wc-core-functions.php(319): apply_filters('woocommerce_cur...', 'ARS')
#3 wp-content/plugins/woocommerce/includes/wc-core-functions.php(701): get_woocommerce_currency()
#4 wp-content/plugins/woocommerce/includes/widgets/class-wc-widget-price-filter.php(45): get_woocommerce_currency_symbol()
#5 wp-includes/class-wp-widget-factory.php(61): WC_Widget_Price_Filter->__construct()
#6 wp-includes/widgets.php(115): WP_Widget_Fact in /wp-content/plugins/warehouse-popups-woocommerce/public/class-warehouse-popups-woocommerce-public.php on line 673

Thanks for your iniciative, regars.