checkout error

While check out i got error of billing is unable

so check the admin section where checkout form is there and there i found the below error how to solve the same

Fatal error: Uncaught Error: Call to a member function meta_exists() on null in /home/public_html/wp-content/plugins/woocommerce/includes/class-wc-checkout.php:1127 Stack trace: #0 /home/public_html/wp-content/plugins/woocommerce-checkout-manager/includes/checkout-billing.php(72): WC_Checkout->get_value(‘billing_country’) #1 /home/public_html/wp-includes/class-wp-hook.php(288): wooccm_checkout_billing_fields(Array) #2 /home/public_html/wp-includes/plugin.php(203): WP_Hook->apply_filters(Array, Array) #3 /home/public_html/wp-content/plugins/woocommerce/includes/class-wc-countries.php(1307): apply_filters(‘woocommerce_bil…’, Array, ‘IN’) #4 /home/public_html/wp-content/plugins/woo-checkout-field-editor-pro/classes/class-wc-checkout-field-editor.php(149): WC_Countries->get_address_fields(‘IN’, ‘billing_’) #5 /home/public_html/wp-content/plugins/woo-checkout-field-editor-pro/classes/class-wc-checkout-field-editor.php(480): WC_Checkout in /home/public_html/wp-content/plugins/woocommerce/includes/class-wc-checkout.php on line 1127