Trying to build a cart using django cart. "" error unhashable type dict ""

Here is the code for view.py in my cart app  please help(also see the screenshot):  

from django.template import loader

from django.http import HttpResponse

from django.template.loader import render_to_string

import django.template.loader

from cart.cart import Cart

from .models import Product

'''from cart.models import Category, Product'''

#gallery    default view

def index(request):

    #prepare the models

    #        empty

    #prepare the template

    template = loader.get_template('templates/cart.html', dict(cart=Cart(request))  )

    #prepare the context

    context = {'request':request}

    return HttpResponse(template.render(context, request))

def add_to_cart(request, product_id, quantity):

    product = Product.objects.get(id=product_id)

    cart = Cart(request)

    cart.add(product, product.unit_price, quantity)

def remove_from_cart(request, product_id):

    product = Product.objects.get(id=product_id)

    cart = Cart(request)

    cart.remove(product)

def get_cart(request):

   

    template = loader.get_template('templates/cart.html', dict(cart = Cart(request))) 

    #prepare the context

    context = {'request':request}

    return HttpResponse(template.render(context, request))

    return HttpResponse(template.render(context, request))

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