Problems in Django login authentication

Views.py file 

from django.shortcuts import render,HttpResponse,redirect

from .models import registration

from django.contrib.auth import authenticate,login

def home(request):

    return render(request,'home.html')

def log_in(request):

    if request.method == 'POST':

        username = request.POST.get('username')

        password = request.POST.get('password')

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

        if user is not None:

            login(request, user)

            return redirect('home')

        else:

            return HttpResponse("You have incorrect Username or password")

    return render(request, 'log_in.html')

def sign_up(request):

    if request.method == 'POST':

        name = request.POST.get('fullname')

        username = request.POST.get('username')

        email = request.POST.get('email')

        pass1 = request.POST.get('password')

        pass2 = request.POST.get('confirm_password')

        if pass1 != pass2:

            return HttpResponse("Password not matched")

        else:

            db = registration()

            db.Name = name

            db.username = username

            db.Email = email

            db.Password = pass1

            db.save()

            return redirect('log_in')

    return render(request,'sign_up.html')

This is models.py for sqlite database:

from django.db import models

class registration(models.Model):

    Name = models.CharField(max_length=100)

    username = models.CharField(max_length=100)

    Email = models.CharField(max_length=100)

    Password = models.CharField(max_length=100)

when providing the correct username and password, the system consistently displays an error message stating "You have incorrect Username or password."

please help me to solve this error.

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