Error in extension NWD Themes Revolution Slider 6.1.1.6 about magento-lts HOT 6 CLOSED

    /**
     * Upload and resize new file
     *
     * @param string $targetPath Target directory
     * @param string $type Type of storage, e.g. image, media etc.
     * @throws Mage_Core_Exception
     * @return array File info Array
     */
    public function uploadFile($targetPath, $type = null)
    {
        $uploader = new Mage_Core_Model_File_Uploader('image');
        if ($allowed = $this->getAllowedExtensions($type)) {
            $uploader->setAllowedExtensions($allowed);
        }
        $uploader->setAllowRenameFiles(true);
        $uploader->setFilesDispersion(false);
        $result = $uploader->save($targetPath);

        if (!$result) {
            Mage::throwException( Mage::helper('cms')->__('Cannot upload file.') );
        }

        // create thumbnail
        if ($this->getUploadType() == 'image') {
            $this->resizeFile($targetPath . DS . $uploader->getUploadedFileName(), true);
        }

        $result['cookie'] = array(
            'name'     => session_name(),
            'value'    => $this->getSession()->getSessionId(),
            'lifetime' => $this->getSession()->getCookieLifetime(),
            'path'     => $this->getSession()->getCookiePath(),
            'domain'   => $this->getSession()->getCookieDomain()
        );

        return $result;
    }

      $session = Mage::getSingleton('core/session');
      $result['cookie'] = array(
            'name'     => session_name(),
            'value'    => $session->getSessionId(),
            'lifetime' => $session->getCookieLifetime(),
            'path'     => $session->getCookiePath(),
            'domain'   => $session->getCookieDomain()
        );