change import

app.py

@@ -4,7 +4,7 @@ from langchain_community.embeddings import OpenAIEmbeddings
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain_community.vectorstores import Chroma
 from langchain.chains import RetrievalQAWithSourcesChain
-from langchain.chat_models import ChatOpenAI
+from langchain_community.chat_models import ChatOpenAI
 from langchain.prompts.chat import (
     ChatPromptTemplate,
     SystemMessagePromptTemplate,
@@ -19,9 +19,9 @@ load_dotenv()
 
 app = FastAPI()
 
-@app.get("/")
-async def read_root():
-    return {"Hello": "World"}
+# @app.get("/")
+# async def read_root():
+#     return {"Hello": "World"}
 
 text_splitter = RecursiveCharacterTextSplitter(chunk_size=1000, chunk_overlap=100)