Bootstrao Carousel not working : the bootstrap carousel in bootstrap 4.0 is not working, i have checked everything and written the code 100% the same:

    <div id="carouselExampleControls" class="carousel slide" data- 
     ride="carousel">
    <div class="carousel-inner">
     <div class="carousel-item active">
     <img class="d-block w-100" src="images/pic03.jpg" alt="First slide"> 
	
     </div>
     <div class="carousel-item">
     <img class="d-block w-100" src="images/pic01.jpg" alt="Second slide">
     </div>
     <div class="carousel-item">
     <img class="d-block w-100" src="images/pic02.jpg" alt="Third slide">
     </div>
     </div>
     <a class="carousel-control-prev" href="#carouselExampleControls" 
     role="button" data-slide="prev">
     <span class="carousel-control-prev-icon" aria-hidden="true"></span>
     <span class="sr-only">Previous</span>
     </a>
     <a class="carousel-control-next" href="#carouselExampleControls" 
     role="button" 
     data-slide="next">
     <span class="carousel-control-next-icon" aria-hidden="true"></span>
     <span class="sr-only">Next</span>
     </a>
     </div>