Update app.py

app.py

@@ -146,8 +146,8 @@ def save_message_to_table(data):
         print(f"Error accessing the file: {response.status_code}")
         return
     
-    # Append the new data
-    df = df.append(data, ignore_index=True)
+    # Append the new data using pd.concat
+    df = pd.concat([df, pd.DataFrame([data])], ignore_index=True)
     
     # Convert the DataFrame back to a file
     if file_path.endswith('.xlsx'):