链接不工作Django

Question

在我的base.html中，导航栏上的链接因某些原因无效。我已经正确地写了它，但当我将鼠标悬停在链接上时它没有做任何事情。

<ul class="nav navbar-nav navbar-right">
                    <li class="active" role="presentation" data-aos="fade-down" data-aos-duration="900"><a href="{% url 'register' %}"><strong>Join Us?</strong></a></li>
                    <li class="active" role="presentation" data-aos="fade-down" data-aos-duration="900"><a href="{% url 'login'%}"><strong>Log In</strong></a></li>

Urls.py

url('^delta/$', aircraft_delta, name='aircraft_delta'),

#aircraft/detail/1
url('^aircraft/detail/(?P<id>\d+)/$', aircraft_detail, name='aircraft_detail'),

#aircraft/
url(r'^aircraft/$', list_aircraft, name='aircraft_home'),

#login/
url(r'^login/', login_view, name="login"),

#logout/
url(r'^logout/', logout_view, name="logout"),

#register/
url(r'^register/', register_view, name="register"),

#upload/aircraft
url(r'^upload/aircraft/$', aircraft_create),

Root urls.py

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^accounts/', include('accounts.urls')),
    url(r'^', include('aircraft.urls')),]