Add row/booking action button to decline a woocomerce booking

decline-booking-row-action.php

/*
 * Add decline button to list view of woocommerce bookings
 */
function wocommerce_bookings_mods_add_custom_booking_status_button_to_bookings_list( $actions, $booking ) {

	// Check if the booking requires a decision
	if ( 'pending-confirmation' === $booking->get_status() ) {

		// Add button to decline the booking
		$actions['decline'] = array(
			'url'    => wp_nonce_url( admin_url( 'admin-ajax.php?action=wc-booking-decline&booking_id=' . $booking->get_id() ), 'wc-booking-decline' ),
			'name'   => __( 'Decline', 'wocommerce-bookings-mods' ),
			'action' => 'decline',
		);
	}

	// Return the array of actions
	return $actions;
}
add_filter( 'woocommerce_admin_booking_actions', 'wocommerce_bookings_mods_add_custom_booking_status_button_to_bookings_list', 20, 2 );

/*
 * Add function to decline a woocomemrce booking via wp_ajax
 */
function wocommerce_bookings_mods_wp_ajax_decline_booking() {

	// Make sure the user is allowed to do this
	if ( ! current_user_can( 'manage_bookings' ) ) {
		wp_die( __( 'You do not have sufficient permissions to access this page.', 'woocommerce-bookings' ) );
	}
	if ( ! check_admin_referer( 'wc-booking-decline' ) ) {
		wp_die( __( 'You have taken too long. Please go back and retry.', 'woocommerce-bookings' ) );
	}
	// Get the booking ID
	$booking_id = isset( $_GET['booking_id'] ) && (int) $_GET['booking_id'] ? (int) $_GET['booking_id'] : '';
	if ( ! $booking_id ) {
		die;
	}
	// Get the booking
	$booking = get_wc_booking( $booking_id );
	// Check if the booking is not the target status
	if ( 'declined' !== $booking->get_status() ) {
		$booking->update_status( 'declined' );
	}

	// Redirect to the bookings list
	wp_safe_redirect( wp_get_referer() );
}
add_action( 'wp_ajax_wc-booking-decline', 'wocommerce_bookings_mods_wp_ajax_decline_booking' );

/*
 * Add css to woocommerce bookings list view to make custom status visible
 */
function wocommerce_bookings_mods_add_css_to_bookings_list() {

	// Get the admin screen
	$screen = get_current_screen();
	// Check if this is the bookings list
	if ( 'edit' === $screen->base AND 'wc_booking' === $screen->post_type ) {
		// Add custom css ?>
		<style type="text/css">
			.type-wc_booking .column-booking_status span.status-declined:before {
				color:   #a00;
				content: "";
			}

			.column-booking_actions a.decline:after {
				content: "";
			}
		</style>
	<?php }
}
add_action( 'admin_head', 'wocommerce_bookings_mods_add_css_to_bookings_list' );

Hi i have been using this code and it has been working well, recently, i have been trying to use it however it takes me to the "You have taken too long. Please go back and retry."

im signed in as Admin. Tried activating and deactivating all plugins, no luck! any ideas?