Symfony 4 - 图像不加载资产

Question

In my app, I use Symfony 4 and I can't load assets! :( In my browser (Chrome) I don't see any images or css styles. Please help! Thanks! :D

My code:

{% for class in classes %}
Name: {{ class.name }}<br>
About: {{ class.aboutInfo }}<br>
Image: <br><img src="{{ class.photolocation }}"><br>
<a href="{{ path("mm_classes_remove", {'slug': class.id}) }}" style="color: 
#ff4455;">Delete</a><br><hr><br>
{% endfor %}