update

app.py

@@ -68,7 +68,6 @@ def select_balanced_samples(samples):
 def generate_random_string(length=8):
     return ''.join(random.choices(string.ascii_letters + string.digits, k=length))
 
-
 @app.route('/', methods=['GET', 'POST'])
 def index():
     logger.info("Rendering index page.")
@@ -102,6 +101,7 @@ def index():
 
             session['responses'] = []  # Initialize responses list
             session['method'] = method  # Store the selected method
+            logger.info(f"Method stored in session: {session['method']}")
 
             return redirect(url_for('experiment', username=username, sample_index=0, seed=seed, filename=filename))
         except Exception as e:
@@ -118,7 +118,10 @@ def experiment(username, sample_index, seed, filename):
         with open(f'session_data/{filename}', 'r') as f:
             selected_samples = json.load(f)
 
-        method = session.get('method')  # Retrieve the selected method
+        method = session.get('method')
+        if not method:
+            logger.error(f"Method not found in session. Session contents: {session.items()}")
+            return "Method not found", 500
 
         if sample_index >= len(selected_samples):
             logger.error(f"Sample index {sample_index} exceeds the number of selected samples {len(selected_samples)}.")