updated

app.py

@@ -32,6 +32,7 @@ app = Flask(
     static_url_path='/static',             # this is the URL route, must start with `/`
     template_folder='backend/templates'
 )
+app.instance_path = os.path.join(os.getcwd(), 'instance')
 app.config['SECRET_KEY'] = 'your-secret-key'
 #
 # Configure the database connection