Python3.x ValueError at register 视图authenticate.views.register_user 未返回HttpResponse 对象.它返回 None 相反

我无法解决这个问题，每次显示views.register_user都没有返回Httppresponse.用户注册也不正常，每次都会显示上面的错误文本.昨天它工作正常，但今天显示错误.那么，如何修复这个错误，如何解决这个问题呢？我已经张贴了我的详细代码，请查收.此外，我已经申请了堆栈溢出答案，但没有工作.

下面是我的代码:

Views.py

from django.shortcuts import render, redirect
from django.contrib.auth import authenticate,login,logout
from django.contrib.auth.forms import UserCreationForm
from django.contrib import messages
from .forms import SignUpForm

def register_user(request):
    if request.method == 'POST':
        form=SignUpForm(request.POST)
        if form.is_valid():
            form.save()
            username = form.cleaned_data['username']
            password = form.cleaned_data['password1']
            user = authenticate(request, username=username, password = password)
            login(request,user)
            messages.success(request,('You Have Been Registered!'))
            return redirect('home')
        
    
    else:
        form = SignUpForm()
        context = {'form': form}
        return render(request,'authenticate/Register.html',context)

Register.html

{% extends 'authenticate/base.html' %}

{% block content %}

<h2 class="text-center">Register</h2>
<div class="col-md-6 offset-md-3">
    <form method="POST" action ="{% url 'register' %}">
            {% csrf_token %}

            {% if form.errors %}

                       
                        <p>Your Form Has Errors.....</p>
                        
               


            {% endif %}
                {{ form.as_p }}
        <input type="submit" value="Register" class="btn btn-secondary">
   </form>

</div>
<br/><br/>
{% endblock  %}

Forms.py

from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth.models import User
from django import forms

class SignUpForm(UserCreationForm):
    email = forms.EmailField(label="",widget=forms.TextInput(attrs={'class':'form-control','placeholder':'Email Address'}))
    first_name = forms.CharField(label="",max_length=100, widget=forms.TextInput(attrs={'class':'form-control','placeholder':'First Name'}))
    last_name = forms.CharField(label="",max_length=100,widget=forms.TextInput(attrs={'class':'form-control','placeholder':'Last Name'}))

    class Meta:
        model = User
        fields = ('username','first_name','last_name','email','password1','password2')

    def __init__(self, *args, **kwargs):
         super(SignUpForm, self).__init__(*args, **kwargs)

         self.fields['username'].widget.attrs['class'] = 'form-control'
         self.fields['username'].widget.attrs['placeholder'] = 'User Name'
         self.fields['username'].label=""
         self.fields['username'].help_text='<span class="form-text text-muted"><small>Required. 150 characters or fewer. Letters, digits and @/./+/-/_ only.</small></span>'
        
         self.fields['password1'].widget.attrs['class'] = 'form-control'
         self.fields['password1'].widget.attrs['placeholder'] = 'Password'
         self.fields['password1'].label=""
         self.fields['password1'].help_text='<ul class="form-text text-muted"><li>Your password can’t be too similar to your other personal information.</li><li>Your password must contain at least 8 characters.</li><li>Your password can’t be a commonly used password.</li><li>Your password can’t be entirely numeric.</li></ul>'
        
         self.fields['password2'].widget.attrs['class'] = 'form-control'
         self.fields['password2'].widget.attrs['placeholder'] = 'Confirm Password'
         self.fields['password2'].label=""
         self.fields['password2'].help_text='<span class="form-text text-muted"><small>Enter the same password as before, for verification.</small></span>'