Issue #3202585: blank.gif - Failed to load resource: the server responded with a status of 404 (Not Found)

templates/drupal-slider-layers.html.twig

 <div class="sp-slide"> 
-	<div class="sp-image"> <img src="../src/images/blank.gif" 
+	<div class="sp-image"> <img src="" 
 		data-src="{{ background_img }}"/>
 	</div> 			 
   {% if layers is not empty %}