/**
 * @param Order $Order
 * @param Shipping $Shipping
 * @param array $Tickets
 */ private function addTickets(Order $Order, Shipping $Shipping, array $Tickets)
 {
 foreach ($Tickets as $Ticket) {
 $Shipping->addTicket($Ticket);
 $Order->addTicket($Ticket);
 $Ticket->setOrder($Order);
 $Ticket->setShipping($Shipping);
 }
 }

Attempted to call an undefined method named "addTicket" of class "Eccube\Entity\Order".

/**
 * Add ticket.
 *
 * @param \Eccube\Entity\Ticket $Ticket
 *
 * @return Order
 */
 public function addTicket(\Eccube\Entity\Ticket $Ticket)
 {
 $this->Tickets[] = $Ticket;
 return $this;
 }