why i have ValueError Django

I have this ValueError

views.py

def category_post(request, category):
    posts = get_object_or_404(Post, category=category)
    return render(request, 'blog/category.html', {'posts': posts})

or

def category_post(request, category):
    posts = Post.objects.filter(category=category)
    return render(request, 'blog/category.html', {'posts': posts})

or

def category_post(request, category):
    posts = Post.objects.get(category=category)
    return render(request, 'blog/category.html', {'posts': posts})

I have this error: invalid literal for int() with base 10: 'business' where i made wrong?