上下文对象Magento 2中已存在MagentoFrameworkStdlibDateTimeTi

我在ubuntu中使用终端进行编译，但在"Magento 2"中发现错误"''Magento''Framework''Stdlib''DateTimeTime''TimezoneInterface已存在于上下文对象中"。

namespace Perception'Bannerslider'Block;
class SliderItem extends 'Magento'Framework'View'Element'Template {
    /**
     * Date conversion model
     * @var 'Magento'Framework'Stdlib'DateTime'DateTime
     */
    protected $_stdlibDateTime;
    /**
     * @var 'Magento'Store'Model'StoreManagerInterface
     */
    protected $_storeManager;
    /**
     * slider factory
     * @var 'Perception'Bannerslider'Model'SliderFactory
     */
    protected $_sliderFactory;
    /**
     * slider model
     * @var 'Perception'Bannerslider'Model'Slider
     */
    protected $_slider;
    /**
     * slider id
     * @var int
     */
    protected $_sliderId;
    /**
     * category Factory
     * @var 'Magento'Catalog'Model'CategoryFactory
     */
    protected $_categoryFactory;
    /**
     * banner slider helper
     * @var 'Perception'Bannerslider'Helper'Data
     */
    protected $_bannersliderHelper;
    /**
     *
     * @var 'Perception'Bannerslider'Model'Resource'Banner'CollectionFactory
     */
    protected $_bannerCollectionFactory;
    protected $_scopeConfig;
    public $timezone;
    /**
     * [__construct description]
     * @param 'Magento'Framework'View'Element'Template'Context                $context                 [description]
     * @param 'Perception'Bannerslider'Model'Resource'Banner'CollectionFactory $bannerCollectionFactory [description]
     * @param 'Perception'Bannerslider'Model'SliderFactory                     $sliderFactory           [description]
     * @param 'Perception'Bannerslider'Model'Slider                            $slider                  [description]
     * @param 'Magento'Framework'Stdlib'DateTime'DateTime                     $stdlibDateTime          [description]
     * @param 'Perception'Bannerslider'Helper'Data                             $bannersliderHelper      [description]
     * @param 'Magento'Catalog'Model'CategoryFactory                          $categoryFactory         [description]
     * @param 'Magento'Framework'ObjectFactory                                $objectFactory           [description]
     * @param 'Magento'Store'Model'StoreManagerInterface                      $storeManager            [description]
     * @param array                                                           $data                    [description]
     */
    public function __construct(
        'Magento'Framework'View'Element'Template'Context $context,
        'Perception'Bannerslider'Model'Resource'Banner'CollectionFactory $bannerCollectionFactory,
        'Perception'Bannerslider'Model'SliderFactory $sliderFactory,
        'Perception'Bannerslider'Model'Slider $slider,
        'Magento'Framework'Stdlib'DateTime'DateTime $stdlibDateTime,
        'Magento'Framework'Stdlib'DateTime'TimezoneInterface $timezone,
        'Perception'Bannerslider'Helper'Data $bannersliderHelper,
        'Magento'Catalog'Model'CategoryFactory $categoryFactory,
        'Magento'Framework'DataObject $objectFactory,
        'Magento'Store'Model'StoreManagerInterface $storeManager,
        array $data = []
    ) {
        parent::__construct($context, $data);
        $this->_sliderFactory = $sliderFactory;
        $this->_slider = $slider;
        $this->_stdlibDateTime = $stdlibDateTime;
        $this->_bannersliderHelper = $bannersliderHelper;
        $this->timezone = $timezone;
        $this->_storeManager = $storeManager;
        $this->_bannerCollectionFactory = $bannerCollectionFactory;
        $this->_categoryFactory = $categoryFactory;
        $this->_scopeConfig = $context->getScopeConfig();
    }
    /**
     * @return
     */
    protected function _toHtml() {
        $store = $this->_storeManager->getStore()->getId();
        $configEnable = $this->_scopeConfig->getValue('bannerslider/general/enable_frontend', 'Magento'Store'Model'ScopeInterface::SCOPE_STORE, $store);
        if (!$configEnable || $this->_slider->getStatus() === '2' || ($this->_slider->getStyleContent() != 2 && $this->getBannerCollection()->getFirstItem()->getId() == null)) {
            return '';
        }
        return parent::_toHtml();
    }
    /**
     * Add elements in layout
     * @return
     */
    protected function _prepareLayout() {
        return parent::_prepareLayout();
    }
    /**
     * set slider Id and set template
     * @param int $sliderId
     */
    public function setSliderId($sliderId) {
        $this->_sliderId = $sliderId;
        $slider = $this->_sliderFactory->create()->load($this->_sliderId);
        if ($slider->getId()) {
            $this->setSlider($slider);
            if ($slider->getStyleContent() == 2) {
                $this->setTemplate('Perception_Bannerslider::slider/custom.phtml');
            } else {
                switch ($slider->getStyleSlide()) {
                    //Evolution slide
                    case 1:case 2:case 3:case 4:
                        $this->setTemplate('Perception_Bannerslider::slider/evolution.phtml');
                        break;
                    case 5:
                        $this->setTemplate('Perception_Bannerslider::slider/popup.phtml');
                        break;
                    //Note all page
                    case 6:
                        $this->setTemplate('Perception_Bannerslider::slider/special/note.phtml');
                        break;
                    // Flex slide
                    default:
                        $this->setTemplate('Perception_Bannerslider::slider/flexslider.phtml');
                        break;
                }
            }
        }
        return $this;
    }
    public function isShowTitle() {
        return $this->_slider->getShowTitle() == 1 ? true : false;
    }
    /**
     * get banner collection of slider
     * @return 'Perception'Bannerslider'Model'Resource'Banner'Collection
     */
    public function getBannerCollection() {
        $storeViewId = $this->_storeManager->getStore()->getId();
        $bannerCollection = $this->_bannerCollectionFactory->create()
                                 ->setStoreViewId($storeViewId)
                                 ->addFieldToFilter('slider_id', $this->_slider->getId())
                                 ->addFieldToFilter('status', 1)
                                 ->setOrder('order_banner', "ASC");
        $bannerCollection->getSelect()->having('start_time < NOW() and end_time > NOW()');
        if ($this->_slider->getSortType() == 1) {
            $bannerCollection->getSelect()->orderRand('main_table.banner_id');
        }
        // $bannerCollection->getSelect()->columns(array($randomise ? 'Rand() as order' : ''));
        return $bannerCollection;
    }
    public function getToday() {
        return $this->_stdlibDateTime->gmtDate();
    }
    // /**
    //  * get slider id
    //  * @return int
    //  */
    // public function getSliderId() {
    //  return $this->_sliderId;
    // }
    public function getPositionNote() {
        switch ($this->_slider->getPositionNote()) {
            case 1:return "top-left";
            case 2:return "middle-top";
            case 3:return "top-right";
            case 4:return "middle-left";
            case 5:return "middle-right";
            case 6:return "bottom-left";
            case 7:return "middle-bottom";
            default:
                return "bottom-right";
        }
    }
    /**
     * set slider model
     * @param 'Perception'Bannerslider'Model'Slider $slider [description]
     */
    public function setSlider('Perception'Bannerslider'Model'Slider $slider) {
        $this->_slider = $slider;
        return $this;
    }
    /**
     * [getSlider description]
     * @return [type] [description]
     */
    public function getSlider() {
        return $this->_slider;
    }
    public function getBannerImageUrl('Perception'Bannerslider'Model'Banner $banner) {
        return $this->_bannersliderHelper->getBaseUrlMedia($banner->getImage());
    }
    public function getBannerTarget($banner) {
        switch ($banner->getTarget()) {
            case 0:
                return '_self';
            case 1:
                return '_parent';
            default:
                return '_blank';
        }
    }
    public function getStdlibDateTime() {
        return $this->_stdlibDateTime;
    }
}

请给我建议如何解决这个错误，以及如果"TimezoneInterface已经存在于上下文中"，我不知道如何获得TimezoneIinterface对象，以及如何将其用于更多引用和获取更多对象数据。