Update app.py

app.py

@@ -10,10 +10,10 @@ from llama_index.core import (
     VectorStoreIndex,
     Document,
     Settings,
-    ChatMessage,
 )
 from llama_index.llms.huggingface import (HuggingFaceLLM, )
 from llama_index.llms.huggingface.api import (HuggingFaceInferenceAPI, )
+from llama_index.core.base.llms import ChatMessage
 from huggingface_hub import login
 import chromadb as chromadb
 from chromadb.utils import embedding_functions