Updated app,py

app.py

@@ -113,7 +113,9 @@ async def on_chat_start():
         os.remove(temp_file_path)
 
     except Exception as e:
-        await cl.Message(f"An error occurred while processing the PDF. Please try again.").send()
+        await cl.Message(f"An error occurred while processing the PDF: {str(e)}").send()
+        import traceback
+        await cl.Message(f"Traceback: {traceback.format_exc()}").send()
 
 @cl.on_message
 async def on_message(message: cl.Message):