i am unable to load static files with django in my template my files are shown below

 Settings.py
============

```
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'Theme'

```

]

```
STATIC_DIR = os.path.join(BASE_DIR, 'static')
STATIC_URL = '/static/'
STATICFILES_DIR = [
STATIC_DIR,
]

```

 Template/index.html
====================

```html
<!DOCTYPE html>
{% load static %}

<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>First App</title>
</head>
<body>
<h1>Hello this is index.html!</h1>
<img src="{% static 'images/mark.jpg' %}" alt="My image">
</body>
</html>
```

 project Direstory 

[This is the projec t directory`](https://i.stack.imgur.com/SX46k.png)