Fix: Resolve Chatbot message format error, asyncio event loop issues, and Mistral API compatibility

app.py

@@ -664,8 +664,9 @@ with gr.Blocks(
             if not message or len(message.strip()) < 2:
                 return chat_history, conv_state, inv_results
             
-            # Add user message to chat
-            chat_history = chat_history + [[message, None]]
+            # Ensure chat_history is a list
+            if chat_history is None:
+                chat_history = []
             
             # Run investigation
             result = ask_investigation_question(message)
@@ -673,14 +674,7 @@ with gr.Blocks(
             # Format response for chat
             if result.get("status") == "error":
                 error_msg = result.get("message", "Investigation failed")
-                ai_response = f"❌ **Investigation Failed**\n\n{error_msg}\n\n"
-                
-                # Add suggestions
-                follow_ups = result.get("follow_ups", [])
-                if follow_ups:
-                    ai_response += "**💡 Try asking:**\n"
-                    for q in follow_ups[:3]:
-                        ai_response += f"• {q}\n"
+                ai_response = f"❌ **Investigation Failed**\n\n{error_msg}"
             else:
                 # Build comprehensive response for chat
                 answer = result.get("answer", "")
@@ -705,17 +699,8 @@ with gr.Blocks(
                 # Store full results for detailed tabs
                 inv_results = result
             
-            # Add AI response to chat
-            chat_history[-1][1] = ai_response
-            
-            # Add follow-up suggestions as next message
-            follow_ups = result.get("follow_ups", [])
-            if follow_ups and result.get("status") == "success":
-                follow_up_msg = "**💬 Would you like to know more about:**\n\n"
-                for idx, q in enumerate(follow_ups[:3], 1):
-                    follow_up_msg += f"{idx}. {q}\n"
-                
-                chat_history.append([None, follow_up_msg])
+            # Add complete [user, assistant] pair to chat history
+            chat_history = chat_history + [[message, ai_response]]
             
             return chat_history, conv_state + [message], inv_results