added "import sys"

backend/generate_metadata.py

@@ -1,9 +1,8 @@
 import os
-
 import argparse
 import json
 import openai
-
+import sys
 from dotenv import load_dotenv
 from langchain_community.document_loaders import TextLoader
 from langchain_community.document_loaders import UnstructuredPDFLoader
@@ -12,7 +11,7 @@ from langchain_text_splitters import RecursiveCharacterTextSplitter
 
 from langchain_community.vectorstores import Vectara
 
-from schema import Metadata, BimDiscipline
+from backend.schema import Metadata, BimDiscipline
 
 load_dotenv()