layout image and hero not showing on child pages

hello,

i have some problem in my children pages :

  1. the image from layout for navbar logo and my html code for hero image not showing, when im inspect on browser it said "the server responded with a status of 404 (Not Found)"

  2. the collection are showing all post, but the url slug is for the selected post from parent page

this is my code for children page :

<!--Hero Section-->
<section style="background: url("assets/img/purple-bg.jpg");background-repeat: no-repeat;background-size: cover;position: relative;">
        <div class="container">
            <div class="div-marketplaceHeader">
                <img class="wherebuyFituno" src="assets/img/produkFituno.png"><small class="txt-contactUs" style="font-size: 40px;color: rgb(255,255,255);">Artikel</small>
            </div>
        </div>
</section>
<!--Content Section-->
<section>
    {{ collection:artikel }}
    <section class="article-clean">
        <div class="container">
            <div class="row">
                <div class="col-lg-10 col-xl-8 offset-lg-1 offset-xl-2">
                    <div class="intro">
                        <h1 class="text-center">{{ title }}</h1>
                        <p class="text-center"><span class="by">oleh</span> <a href="#">{{ author }}</a><span class="date">{{ date }}</span></p>
                        {{ gambar_artikel }}
                        <img class="img-fluid img-artikel" src="{{url}}" style="width: 525px;">
                        {{ /gambar_artikel }}
                    </div>
                    <div class="text">
                        <p style="text-align: justify;font-size: 16px;">{{ konten_artikel }}</p>
                        <figure class="figure d-block">
                            <figcaption class="figure-caption"></figcaption>
                        </figure>
                    </div>
                </div>
            </div>
        </div>
    </section>
    {{ /collection:artikel }}
</section>

i just try a basic logic for selected collection but its not working,someone can help me?

Answered by excel!
>>>>>>> Answered <<<<<<<
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