슬라이드 이미지 주소를 어떻게 바꿔야 하나요?

바쁘신데 제가 너무 몰라서 질문을 많이 드리네요.
많은 가르침 부탁 드리겠습니다.


메인화면 슬라이드 이미지 주소를 아무리 바꾸려고 해도
오류만 생기고 안되네요.

 

<!-------------------------- 슬라이드 -------------------------->

<header>

  <div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">

<ol class="carousel-indicators">

  <li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>

  <li data-target="#carouselExampleIndicators" data-slide-to="1"></li>

  <li data-target="#carouselExampleIndicators" data-slide-to="2"></li>

  <li data-target="#carouselExampleIndicators" data-slide-to="3"></li>

  <li data-target="#carouselExampleIndicators" data-slide-to="4"></li>   

  <li data-target="#carouselExampleIndicators" data-slide-to="5"></li>

</ol>

<div class="carousel-inner" role="listbox">

  <!-- Slide One - Set the background image for this slide in the line below -->

  <div class="carousel-item active" style="background-image: url('<?php echo G5_THEME_URL?>/img/background02.jpg')">

  <div class="carousel-caption d-none d-md-block">

  <h3 class="ko1">ㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂ</h3>

  <p class="ko1 f20">ㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂ</p>

</div>

  </div>

  <!-- Slide Two - Set the background image for this slide in the line below -->

  <div class="carousel-item" style="background-image: url('<?php echo G5_THEME_URL?>/img/background05.jpg')">

<div class="carousel-caption d-none d-md-block">

  <h3 class="ko1">ㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂㅂ</h3>

  <p class="ko1 f20">ㄷㄷㄷㄷㄷㄷㄷㄷㄷㄷㄷㄷㄷㄷㄷㄷㄷㄷ</p>

</div>

  </div>

  <!-- Slide Three - Set the background image for this slide in the line below -->

  <div class="carousel-item" style="background-image: url('<?php echo G5_THEME_URL?>/img/background01.jpg')">

<div class="carousel-caption d-none d-md-block">

  <h3 class="ko1">ㅈㅈㅈㅈㅈㅈㅈㅈㅈㅈㅈㅈㅈㅈ</h3>

  <p class="ko1 f20">ㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇ</p>

</div>

  </div>

</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>

</header>

<div class="margin-top-80"></div>