Error with Django and Cloudinary - can not use the string pattern on a bytes-like object

I'm trying to make a simple app: I've done the Django Girls tutorial and now I'm trying to use it as well including an image using the < a href="http://cloudinary.com/"> Cloudinary

But I'm having the following error:

Theerroroccursatlineupload_result=cloudinary.uploader.upload(file)offileviews.py

Followcode

models.py

fromdjango.dbimportmodelsfromdjango.utilsimporttimezonefromcloudinary.modelsimportCloudinaryFieldclassPost(models.Model):author=models.ForeignKey('auth.User')title=models.CharField(max_length=200)text=models.TextField()create_date=models.DateTimeField(default=timezone.now)published_date=models.DateTimeField(blank=True,null=True)image_url=CloudinaryField('imagem',blank=True,null=True)defpublish(sefl):self.published_date=timezone.now()self.save()def__str__(self):returnself.title

views.py

defpost_new(request):upload_result=Nonethumbnail=Noneifrequest.method=="POST":
        form = PostForm(request.POST, request.FILES)
        if form.is_valid():
            file = request.FILES['image_url']
            if file:
                upload_result = cloudinary.uploader.upload(file)
                thumbnail, option = cloudinary_url(upload_result['public_id'], format="jpg", crop="fill", width=100, height=100)

            post = form.save(commit=False)
            post.author = request.user
            post.published_date = timezone.now()
            post.save()
            return redirect('post_detail', pk=post.pk)
    else:
        form = PostForm()
    return render(request, 'blog/post_edit.html', {'form': form})

post_edit.html

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

{% load cloudinary %}

{% block content %}
    <h1>Nova postagem</h1>

    <form action="" method="post" class="post-form" enctype="multipart/form-data">
        {% csrf_token %}

        {{ form.as_table }}

        <br />
        <div class="col-md-3">
            <input type="submit" value="Salvar" class="btn btn-success">
        </div>
    </form>
{% endblock %}

If anyone can, include the cloudinary tag.