Session.php

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<?php
namespace Magento\Newsletter\Model;

class Session extends \Magento\Framework\Session\SessionManager
{
    public function addError($message)
    {
        $this->setErrorMessage($message);
        return $this;
    }

    public function addSuccess($message)
    {
        $this->setSuccessMessage($message);
        return $this;
    }

    public function getError()
    {
        $message = $this->getErrorMessage();
        $this->unsErrorMessage();
        return $message;
    }

    public function getSuccess()
    {
        $message = $this->getSuccessMessage();
        $this->unsSuccessMessage();
        return $message;
    }
}