The slider does not see the photo why?

Question

css

<article class="slider_item active"
                  data-slider-bg="file:///C:/Users/Lenovo/Desktop/zm/img/slide/image__5.png">

                </article>

                <article class="slider_item"
                  data-slider-bg="file:///C:/Users/Lenovo/Desktop/zm/img/slide/image__7.png">

                </article>

                <article class="slider_item"
                  data-slider-bg="file:///C:/Users/Lenovo/Desktop/zm/img/slide/image__8.png">

                </article>

              </div>
              <div class="slider-prev">&lt;</div>
              <div class="slider-next">&gt;</div>
              </section><code lang="html">

</code>

.slider {
  display: block;
  width: 100%;
  float: left;
  position: absolute;
}

.slider .slider_item {
  display: block;
  float: left;
  width: 100%;
  height: 600px;
  background-size: cover;
  background-position: center;
  background-color: #fff;
  position: absolute;
  transition-property: all;
  transition-duration: 0.5s;
  transition-timing-function: ease-in;
  transition-delay: 0.3s;
  opacity: 0;
}

.slider .slider_item.active {
  opacity: 1;
}

.slider .slider_item img {
  width: 100%;
  display: block;
  float: left;
}

.slider .slider_box {
  float: left;
  width: 100%;
  height: 100%;
  position: relative;
}

.slider .slider_content {
  display: block;
  float: left;
  width: 100%;
  height: 100%;
  padding: 150px 20% 15px 20%;
  background: rgba(0, 0, 0, 0.38);
  position: absolute;
  bottom: 0;
  left: 0;
  text-align: center;
}

.slider .slider_content h2 {
  font-size: 3.5em;
  color: #fff;
  text-transform: uppercase;
  padding-bottom: 45px;
  font-weight: bold;
  transition-property: all;
  transition-duration: 0.8s;
  transition-timing-function: ease-in;
  transition-delay: 0.3s;
}

.slider .slider_content p {
  display: block;
  float: left;
  width: 100%;
  color: #fff;
  font-size: 1.8em;
  font-weight: lighter;
  text-align: center;
  transition-property: all;
  transition-duration: 0.8s;
  transition-timing-function: ease-in;
  transition-delay: 0.8s;
}

.slider .active h2,
.slider .active p {
  top: 0;
  opacity: 1;
}

.slider-next,
.slider-prev {
  width: 120px;
  height: 120px;
  color: #fff;
  text-align: center;
  font-size: 3em;
  line-height: 120px;
  font-weight: lighter;
  border-radius: 100px;
  background: rgba(0, 0, 0, 0.5);
  position: absolute;
  top: 220px;
  left: 15px;
  z-index: 99;
}
.slider-next {
  right: 15px;
  left: auto;
  z-index: 100;
}
.slider-next:hover,
.slider-prev:hover {
  background: rgba(0, 0, 0, 0.8);
  transition-property: all;
  transition-duration: 0.5s;
  transition-timing-function: ease-out;
  transition-delay: 0.2s;
  cursor: pointer;
}

(function ($) {

  (function ($) {
    $('.slider_item').each(function () {
      var sliderBg = $(this).data('slider-bg');
      $(this).css({ 'background-image': 'url(' + sliderBg + ')' });
    });
  }(jQuery));


  var nextSlider = function () {
    if ($('.slider_item.active').next('.slider_item').size()) {

      $('.slider_item.active').each(function () {
        $(this).next('.slider_item').addClass('active');
        $(this).removeClass('active');
      });

    } else {
      $('.slider_item.active').each(function () {
        $('.slider_item').removeClass('active');
        $('.slider_item:eq(0)').addClass('active');
      });
    }
  }

  var prevSlider = function () {
    if ($('.slider_item.active').index() > 1) {
      $('.slider_item.active').each(function () {
        $(this).prev('.slider_item').addClass('active');
        $(this).removeClass('active');
      });

    } else {
      $('.slider_item.active').each(function () {
        $('.slider_item').removeClass('active');
        $('.slider_item:last-of-type').addClass('active');
      });
    }
  }

  var sliderAuto = setInterval(nextSlider, 3000);

  $('.slider_content, .slider-next, .slider-prev').hover(function () {
    clearInterval(sliderAuto);
  }, function () {
    sliderAuto = setInterval(nextSlider, 3000);
  });

  $('.slider-next').click(function (event) {
    event.preventDefault();
    nextSlider();
  });

  $('.slider-prev').click(function (event) {
    event.preventDefault();
    prevSlider();
  });


}(jQuery))