Not compatible with WooCommerce 2.3.4

Just upgraded WooCommerce, and now I get the following error message and nothing on frontend or backend loads:

Fatal error: Class ‘WC_Payment_Gateway’ not found in [REMOVED FOR PRIVACY]/wp-content/plugins/woocommerce-gateway-balanced-payments_off/classes/class-wc-balanced-payments-cc.php on line 12

Please fix!

Thanks.

https://wordpress.org/plugins/woocommerce-gateway-balanced-payments/