CRITICAL Uncaught Error checkout_billing_fields() | WordPress.org

FIX

FILE: /wp-content/plugins/funnel-builder/modules/checkouts/compatibilities/setup-theme/class-extra-checkout-fields-for-brazil.php

LINES: 86 and 89

if ( isset( $fields['billing'] ) ) {
	//$fields['billing'] = $this->instance->checkout_billing_fields( $fields['billing'] ); // ERROR
	$fields['billing'] = apply_filters('woocommerce_billing_fields', $fields['billing']); // FIX
}
if ( isset( $fields['shipping'] ) ) {
	//$fields['shipping'] = $this->instance->checkout_shipping_fields( $fields['shipping'] ); // ERROR
	$fields['shipping'] = apply_filters('woocommerce_shipping_fields', $fields['shipping']); // FIX
}