Image Assets not showing

hello,

i put image on default assets container and it not showing to my frontend when im call it, and when im inspect on browser i found a message

"[Error] Failed to load resource: the server responded with a status of 404 (Not Found) ([{}], line 0)"

here my code :

{{ collection:artikel }}
            <div class="card" style="width: 400px; padding-left: 3%; padding-right: 3%"><img class="card-img-top w-100 d-block" src="{{ gambar_artikel }}" style="width: 399px;">
                <div class="card-body">
                    <h4 class="card-title" style="color: rgb(231,4,132);">{{ title }}<br></h4>
                    <p class="card-text" style="text-align: left;">{{ sinopsis }}..<br></p><a class="btn btn-primary" role="button" style="background: rgb(231,4,132);border-style: none;" href="{{ url }}">Lihat Selengkapnya</a>
                </div>
            </div>
            {{ /collection:artikel }}