This is most likely caused by one or more code errors. Without a link, it's impossible to be more specific.
In the meantime, the code below works. Compare it with what you have.
<!doctype html>
<html lang="en-US">
<head>
<meta charset="utf-8">
<title>Bootstrap 3.7 Carousel</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<!-- Latest Bootstrap 3 CSS-->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<style>
.center-block {float:none}
</style>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-sm-10 center-block">
<!--begin Bootstrap Carousel-->
<div id="myCarousel" class="carousel slide" data-ride="carousel" data-interval="false">
<!-- Slide Indicators -->
<ol class="carousel-indicators">
<li data-target="#myCarousel" data-slide-to="0" class="active"></li>
<li data-target="#myCarousel" data-slide-to="1"></li>
<li data-target="#myCarousel" data-slide-to="2"></li>
<li data-target="#myCarousel" data-slide-to="3"></li>
</ol>
<!-- Wrapper for slides -->
<div class="carousel-inner" role="listbox">
<div class="item active">
<img src="https://placeimg.com/1200/475/nature" alt="...">
<div class="carousel-caption">
<h3>Heading</h3>
<p>Caption</p>
</div>
</div>
<div class="item">
<img src="https://placeimg.com/1200/475/arch/3" alt="...">
<div class="carousel-caption">
<h3>Heading</h3>
<p>Caption</p>
</div>
</div>
<div class="item">
<img src="https://placeimg.com/1200/475/tech" alt="...">
<div class="carousel-caption">
<h3>Heading</h3>
<p>Caption</p>
</div>
</div>
<div class="item">
<img src="https://placeimg.com/1200/475/animals" alt="...">
<div class="carousel-caption">
<h3>Heading</h3>
<p>Caption</p>
</div>
</div>
</div>
<!-- Left and right controls -->
<a class="left carousel-control" href="#myCarousel" role="button" data-slide="prev">
<span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>
<span class="sr-only">Previous</span> </a> <a class="right carousel-control" href="#myCarousel" role="button" data-slide="next">
<span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span>
<span class="sr-only">Next</span> </a>
<!--/carousel--></div>
<!--/col--></div>
<!--/row--></div>
<!--/container--></div>
<!--latest jQuery 3-->
<script src="https://code.jquery.com/jquery-3.2.1.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script>
<!--Latest Bootstrap 3 JS-->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
</body>
</html>