After activating Advanced Coupons For WooCommerce plugins, you might get an Invalid Post Type error message when you try to create a new coupon.
This error is happened because the coupon functionality has not been enabled on your website. To resolve this error, make sure to enable your coupons on your WooCommerce Settings. Go to your Dashboard, click Woocommerce > Settings > General > then tick the Enable Coupons option.
After enabling this option, you may now start creating your coupons.