Update app.py

app.py

@@ -55,12 +55,32 @@ def chat_handler(message, history):
     return history
 
 # UI wiring for the Chat tab
-with gr.Tab("Chat"):
-    # Chatbot using new 'messages' format
-    chatbot = gr.Chatbot(label="Programming Assistant", type="messages")
-    chat_input = gr.Textbox(label="Ask anything about programming...", placeholder="e.g. 'generate python: scraper'")
-    send_btn = gr.Button("Send")
-    clear_btn = gr.Button("Clear")
+with gr.Blocks() as app:
+
+    with gr.Tab("Chat"):
+        chatbot = gr.Chatbot(type="messages")
+        chat_input = gr.Textbox(label="Ask anything...")
+        send_btn = gr.Button("Send")
+        clear_btn = gr.Button("Clear")
+
+        def chat_handler(message, history):
+            history = history or []
+            msg = (message or "").strip()
+            if not msg:
+                history.append({"role": "assistant", "content": "Please type a message."})
+                return history
+
+            # simple logic
+            reply = f"You said: {msg}"
+            history.append({"role": "user", "content": message})
+            history.append({"role": "assistant", "content": reply})
+            return history
+
+        # ✅ These must be inside the same `with gr.Tab()` block
+        send_btn.click(chat_handler, inputs=[chat_input, chatbot], outputs=chatbot)
+        chat_input.submit(chat_handler, inputs=[chat_input, chatbot], outputs=chatbot)
+        clear_btn.click(lambda: [], None, chatbot, queue=False)
+
 
     # Callback for chat
     def chat_handler(message, history):