Update app/main.py

app/main.py

@@ -18,7 +18,7 @@ from pydantic import BaseModel
 # Import LangChain components
 from langchain_openai import ChatOpenAI
 from langchain.prompts import PromptTemplate
-from langchain import RunnableSequence
+from langchain.schema.runnable import RunnableSequence
 
 # Import the base LLM class to build our custom wrapper
 from langchain.llms.base import LLM