Update app.py

app.py

@@ -253,14 +253,21 @@ with gr.Blocks(
             
             return filename
 
-        save_button.click(
-            fn=save_chat_history,
-            inputs=[gr.ChatInterface.chatbot],
-            outputs=download_button
-        ).then(
-            lambda: gr.update(visible=True),
-            outputs=download_button
-        )
+        with gr.Blocks() as demo:
+            chatbot = gr.Chatbot()
+            username_input = gr.Textbox(label="Username")
+            save_button = gr.Button("Save Chat History")
+            download_button = gr.File(label="Download Chat History", visible=False)
+        
+            save_button.click(
+                fn=save_chat_history,
+                inputs=[chatbot, username_input],
+                outputs=download_button
+            ).then(
+                fn=lambda: gr.update(visible=True),
+                outputs=download_button
+            )
+
 #launching chatbot
 demo.launch()