I am getting the following error in Django:

NoReverseMatch at /revision/login_user/ Reverse for 'module-add'
with arguments '()' and keyword arguments '{}' not found. 0 pattern(s) tried:

[]I am not really sure why i am getting this error.

These are my views for logging in: (Traceback refers to here)

def login_user(request):
  if request.method == "POST":
    username = request.POST['username']
    password = request.POST['password']
    user = authenticate(username=username, password=password)
    if user is not None:
        if user.is_active:
            login(request, user)
            modules = Module.objects.filter(user=request.user)
            return render(request, 'revision/index.html', {'modules': modules})
        else:
            return render(request, 'revision/login.html', {'error_message': 'Your account has been disabled'})
    else:
        return render(request, 'revision/login.html', {'error_message': 'Invalid login'})
return render(request, 'revision/login.html')

Same with register:

def register(request):
  form = UserForm(request.POST or None)
  if form.is_valid():
    user = form.save(commit=False)
    username = form.cleaned_data['username']
    password = form.cleaned_data['password']
    user.set_password(password)
    user.save()
    user = authenticate(username=username, password=password)
    if user is not None:
        if user.is_active:
            login(request, user)
            modules = Module.objects.filter(user=request.user)
            return render(request, 'revision/index.html', {'modules': modules})

context = {
    "form": form,
}
return render(request, 'revision/register.html', context)

Both refer to the line of return render(request, 'revision/index.html', {'modules': modules}) How do I fix this issue?