我正在嘗試打印博客下方的評(píng)論，但單擊提交按鈕后出現(xiàn)上述錯(cuò)誤。我只想在網(wǎng)頁頂部顯示一條成功消息，為此我編寫了以下行：messages.success(request, 'your comment has been added')，但出現(xiàn)錯(cuò)誤！models.py:from django.db import modelsfrom django.contrib.auth.models import Userfrom django.utils.timezone import now# Create your models here.class Post(models.Model):    sno = models.AutoField(primary_key=True)    title = models.CharField(max_length=50)    content = models.TextField()    author = models.CharField(max_length=50)    slug = models.SlugField(max_length=200)    timeStamp = models.DateTimeField(blank=True)    def __str__(self):        return self.title + " by " + self.authorclass BlogComment(models.Model):    sno = models.AutoField(primary_key=True)    comment = models.TextField()    user = models.ForeignKey(User, on_delete=models.CASCADE)    post = models.ForeignKey(Post, on_delete=models.CASCADE)    parent = models.ForeignKey('self', on_delete=models.CASCADE, null=True)    timestamp = models.DateTimeField(default=now)urls.py:from django.urls import path, includefrom blog import viewsurlpatterns = [    path('postComment', views.postComment, name='postComment'),    path('', views.blogHome, name='home'),    path('<str:slug>', views.blogPost, name='blogpost'),]view.py:from django.shortcuts import render, HttpResponse, redirectfrom blog.models import Post, BlogCommentdef blogHome(request):    allpost = Post.objects.all()    context = {'allposts': allpost}    return render(request, 'blog/blogHome.html', context)def blogPost(request, slug):    post = Post.objects.filter(slug=slug).first()    comments = BlogComment.objects.filter(post=post)    context = {'post': post, 'comments': comments}    return render(request, 'blog/blogPost.html', context)