Update app.py

app.py

@@ -10,7 +10,7 @@ logging.getLogger().addHandler(logging.StreamHandler(stream=sys.stdout))
 from llama_index.tools import QueryEngineTool, ToolMetadata
 from llama_index.query_engine import SubQuestionQueryEngine 
 
-from llama_index import VectorStoreIndex, SimpleDirectoryReader, ServiceContext
+from llama_index.core import VectorStoreIndex, SimpleDirectoryReader, ServiceContext
 from llama_index.llms import HuggingFaceLLM
 #from langchain.embeddings import HuggingFaceEmbeddings, HuggingFaceInstructEmbeddings 
 #from langchain_community.embeddings import HuggingFaceInstructEmbeddings