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app.py

@@ -122,15 +122,19 @@ with gr.Blocks() as demo:
                 with gr.Column(scale=1):
                     chat_img_input = gr.Image(type="pil", label="Document Attachment")
                 with gr.Column(scale=2):
-                    # REMOVED: type="messages" to make it compatible with all Gradio versions
-                    chatbot = gr.Chatbot(label="Chat Interface", height=400)
+                    # ✨ THE FIX: We explicitly define type="tuples" so Gradio accepts our format without crashing
+                    chatbot = gr.Chatbot(label="Chat Interface", height=400, type="tuples")
                     with gr.Row():
                         chat_input = gr.Textbox(placeholder="Ask anything...", show_label=False)
                         send_btn = gr.Button("Send")
             
-            # REVERTED back to standard list of tuples format
             def chat_wrapper(image, user_message, chat_history):
+                # Ensure chat_history is a list
+                if chat_history is None:
+                    chat_history = []
+                
                 ai_response = run_qwen(image, user_message, max_tokens=200)
+                # Appending as a tuple (user_message, ai_response) which matches type="tuples"
                 chat_history.append((user_message, ai_response))
                 return "", chat_history