Error Fix

app.py

@@ -122,21 +122,25 @@ def process_text_query(query, history):
                 context = f"The database contains the following tables:\n" + "\n".join(table_info)
                 response = document_assistant.process_query(f"{context}\n\nUser query: {query}")
                 
-                # Update history
-                history.append((query, response))
+                # Update history with message format
+                history.append({"role": "user", "content": query})
+                history.append({"role": "assistant", "content": response})
             else:
                 # No tables found
-                history.append((query, "No CSV data has been uploaded yet. Please upload a CSV file first."))
+                history.append({"role": "user", "content": query})
+                history.append({"role": "assistant", "content": "No CSV data has been uploaded yet. Please upload a CSV file first."})
             
             conn.close()
         except Exception as e:
             # Fall back to regular document query
             response = document_assistant.process_query(query)
-            history.append((query, response))
+            history.append({"role": "user", "content": query})
+            history.append({"role": "assistant", "content": response})
     else:
         # Process regular document query
         response = document_assistant.process_query(query)
-        history.append((query, response))
+        history.append({"role": "user", "content": query})
+        history.append({"role": "assistant", "content": response})
     
     return "", history
 
@@ -186,7 +190,17 @@ def process_voice_input(audio_path):
 
 def text_to_speech_output(text):
     """Convert text to speech"""
-    if not text:
+    if not text or len(text) == 0:
+        return None
+    
+    # Extract the last assistant message
+    last_message = None
+    for msg in reversed(text):
+        if msg["role"] == "assistant":
+            last_message = msg["content"]
+            break
+    
+    if not last_message:
         return None
     
     # Since we don't have VoiceAssistant, return None