Update app.py

app.py

@@ -67,7 +67,7 @@ def store_document_data(PDF_FILE, METADATA_FILE, INDEX_FILE):
     metadata[str(doc_index)] = PDF_FILE
     print(" Saved Metadata")
 
-    return [{"metadata": metadata}, {"index": index}]
+    return json.dumps({"metadata": metadata}, {"index": index})
 
 def retrieve_document(query):
     print(f"Retrieving document based on:\n{query}")