Update app.py

app.py

@@ -63,7 +63,7 @@ llm= LLM = G4FLLM(
 Settings.llm = LangChainLLM(llm=llm)
 #embed_model=embed_model)
 
-Settings.service_context = ServiceContext.from_defaults(chunk_size=5512, llm=llm, embed_model=embed_model )
+service_context = ServiceContext.from_defaults(chunk_size=5512, llm=llm, embed_model=embed_model )
 
 
 # rebuild storage context