Update src/llamaindex_backend.py

src/llamaindex_backend.py

@@ -63,7 +63,7 @@ class GLlamaIndex():
             result = await self.index.retrieve_context(query)
             return result["result"]
             
-        extended_query = f"{format_history(history[-2:])}\n{query}"
+        extended_query = f"{self.format_history(history[-2:])}\n{query}"
 
         results = await self.index.aretrieve_context_multi(
             [query, extended_query]