django-NoReverseMatch at /projects/ Reverse for 'user-profile' with arguments '('',)' 找不到

我刚开始使用 Django，我不知道这个错误的确切来源。它可能与所有者属性有关。到目前为止，这是我的代码。

项目/mode.py

class Project(models.Model):
    owner = models.ForeignKey(Profile, null=True, blank=True, on_delete=models.SET_NULL)
    title = models.CharField(max_length=200)
    

用户/models.py

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE, null=True, blank=True)
    name = models.CharField(max_length=200, blank=True, null=True)
    

projects/views.py

def projects(request):
    projects = Project.objects.all()
    context = {'projects':projects}
    return render(request, 'projects/projects.html', context)

projects.html

{% for project in projects %}

{{project.owner.name}}

{% endfor %}

users/views.py

def userProfile(request, pk):
    profile = Profile.objects.get(id=pk)
    context = {'profile':profile}
    return render(request, 'users/user-profile.html', context)