Error when creating a search functionality

Environment:


Request Method: GET
Request URL: http://127.0.0.1:8000/search/?q=1

Django Version: 2.2.3
Python Version: 3.6.8
Installed Applications:
['app',
 'material',
 'crispy_forms',
 'material.admin',
 'imagekit',
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.sitemaps',
 'django.contrib.sites',
 'django_admin_reset',
 'gallery',
 'watermarker',
 'whitenoise.runserver_nostatic',
 'user.apps.UserConfig']
Installed Middleware:
('whitenoise.middleware.WhiteNoiseMiddleware',
 'django.middleware.security.SecurityMiddleware',
 'whitenoise.middleware.WhiteNoiseMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'material.frontend.middleware.SmoothNavigationMiddleware',
 'material.frontend.middleware.TurbolinksMiddleware')



Traceback:

File "/home/moringa-school/Documents/django-photo-gallery-master/django_photo_gallery/virtual/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
  34.             response = get_response(request)

File "/home/moringa-school/Documents/django-photo-gallery-master/django_photo_gallery/virtual/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  115.                 response = self.process_exception_by_middleware(e, request)

File "/home/moringa-school/Documents/django-photo-gallery-master/django_photo_gallery/virtual/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
  113.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/home/moringa-school/Documents/django-photo-gallery-master/django_photo_gallery/virtual/lib/python3.6/site-packages/django/views/generic/base.py" in view
  71.             return self.dispatch(request, *args, **kwargs)

File "/home/moringa-school/Documents/django-photo-gallery-master/django_photo_gallery/virtual/lib/python3.6/site-packages/django/views/generic/base.py" in dispatch
  97.         return handler(request, *args, **kwargs)

File "/home/moringa-school/Documents/django-photo-gallery-master/django_photo_gallery/virtual/lib/python3.6/site-packages/django/views/generic/detail.py" in get
  106.         self.object = self.get_object()

File "/home/moringa-school/Documents/django-photo-gallery-master/django_photo_gallery/virtual/lib/python3.6/site-packages/django/views/generic/detail.py" in get_object
  47.                 "pk or a slug in the URLconf." % self.__class__.__name__

Exception Type: AttributeError at /search/
Exception Value: Generic detail view SearchResultsView must be called with either an object pk or a slug in the URLconf.