Why is_valid returns none when I use passwordchangeform in my views.py? I'm perfectly sure that the data I ha entered are correct.

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Python

HTML5

Django

def passchange(request):
    if request.user.is_authenticated:
        if request.method == "POST":
            print(request.POST)
            fm = PasswordChangeForm(user=request.user, data=request.POST)
            print(fm)
            if fm.is_valid():
                fm.save()
                update_session_auth_hash(request, fm.user)
                messages.success(request, 'Password Changed Successfully')
                if fm.user.location=="Latur":
                    return HttpResponseRedirect('/laturhome/')
                elif fm.user.location=="Nashik":
                    return HttpResponseRedirect('/nashikhome/')
                elif fm.user.location=="Dhule":
                    return HttpResponseRedirect('/dhulehome/')
                elif fm.user.location=="Akola":
                    return HttpResponseRedirect('/akolahome/')
                elif fm.user.location=="Solapur":
                    return HttpResponseRedirect('/solapurhome/')
            else:
                print(fm.error_messages)
                return HttpResponse('Not valid')
        else:
            fm = PasswordChangeForm(user=request.user)
            return render(request, 'account/passchange.html', {'form':fm})
    else:
        return HttpResponseRedirect('/login/')

What I have tried:

I had to create a custom user model using AbstractBaseUser as I needed some more fields in my registration form. But since then, all my view functions which involve is_valid method, failed to validate the entered data and I had to validate them manually. Similarly, When I'm up to creating a password change form using PasswordChangeForm, the validation fails and gives me ValueError returning None. Only this time I'm struggling to figure out how to validate the entered data without using is_valid() method. Is there a way?