Loop php in Carousel with Bootstrap indicators

Question

I am creating a Carousel via bootstrap. The problem is that my div: <div class="carousel-inner"> is empty with ::after. Below follows my code:

<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
 <ol class="carousel-indicators">
<?php
$i = 0;
while ($linha = $stmt->fetch(PDO::FETCH_ASSOC)) { ?>
    <li data-target="#carouselExampleIndicators" data-slide-to="<?php echo $i?>"></li>

<?php $i = $i + 1; }?>
 
  </ol>
  <div class="carousel-inner">
<?php while ($linha = $stmt->fetch(PDO::FETCH_ASSOC)) { ?>
    <div class="carousel-item">
      <img class="d-block w-100" src="UPLOAD/<?PHP echo $linha['imagem']?>" alt="First slide">
    </div>
<?php }?>
  </div>
  <a class="carousel-control-prev" href="#carouselExampleIndicators" 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="#carouselExampleIndicators" role="button" data-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="sr-only">Next</span>
  </a>
</div>

[![insert image description here][2][2]