Unable to Login

Hello , am new to Django and i created a login page ,but unable to get login , please help me to solve this , thank you in advance 

views.py : 

===========

from django.views import *

from django.shortcuts import render, redirect

from django.http import HttpResponse

from django.contrib.auth import authenticate

from django.contrib.auth.models import User

from django.contrib.auth import authenticate, login

# Create your views here.

def signup(request):

    if request.method == "POST":

        if request.POST['password1'] == request.POST['password2']:

            try:

                User.objects.get(username=request.POST['username'])

                return render(request,'accounts/signup.html',{'error':"Username already exist"})

            except User.DoesNotExist:

                user=User.objects.create_user(request.POST['username'],request.POST['password1'])

                login(request,user)

                return render(request,'accounts/signup.html',{'error':"user account created  Successfully "})

        else:

            return render(request,'accounts/signup.html',{'error':"password didnt match"})

    else:

        return render(request,'accounts/signup.html')

def loginview(request):

    if request.method=="POST":

         username=request.POST['username']

         password=request.POST['password']

         user=authenticate(username=username,password=password)

         if user is not None:

             login(request,user)

             return render(request,'accounts/login.html',{"error":"Login successful!!"})

         else:

            return render(request,'accounts/login.html',{"error":"username and password didnt match"})

    else:

         return render(request,'accounts/login.html')

Note : when i enter login credentials , i unable to get message " Login successful" . please solve me on this  

urls.py :

=====

from django.contrib import admin

from django.urls import path

import accounts.views

urlpatterns = [

    path('admin/', admin.site.urls),

    path('signup/', accounts.views.signup,name='signup'),

    path('login/', accounts.views.loginview,name='login'),

]

login.html:

=======

<h1>Login</h1>

{% if error %}

{{ error }}

<br><br>

{% endif %}

<form method = "POST" action="{% url 'login' %}">

{% csrf_token %}

Username:

<br>

<input type="text" name="username" placeholder = "username">

<br>

Password:

<br>

<input type="password" name="password" placeholder="password">

<br>

<br>

<input type="submit" value ="Login">

</form>

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