I have no idea with this problem.. Navbar's Dropdown doesn't work! with this message
this is my code
<head>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNavDropdown">
<ul class="navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Features</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Pricing</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
<a class="dropdown-item" href="{%url 'home'%}">Portfolio</a>
<a class="dropdown-item" href="{%url 'signup'%}">회원가입</a>
<a class="dropdown-item" href="{%url 'login'%}">로그인</a>
<a class="dropdown-item" href="#">로그아웃</a>
</div>
</li>
</ul>
</div>
</nav>
{%block contents%} {%endblock%}
I think Bootstrap CDN is not correct you are missing something.
try this & tell is it working?