Add the DEFAULT_AUTO_FIELD which was previously deleted

social_network/social_network/settings.py

@@ -133,3 +133,8 @@ REST_FRAMEWORK = {
 # Folder to store media data
 MEDIA_URL = '/media/'
 MEDIA_ROOT = os.path.join(BASE_DIR, 'media')
+
+# Default primary key field type
+# https://docs.djangoproject.com/en/3.2/ref/settings/#default-auto-field
+
+DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'