Update app.py

app.py

@@ -23,7 +23,7 @@ try:
 except:
     from llama_index import GPTVectorStoreIndex, SimpleDirectoryReader
 
-    documents = SimpleDirectoryReader("./hitchhikers.pdf").load_data()
+    documents = SimpleDirectoryReader(input_files=["hitchhikers.pdf"]).load_data()
     index = GPTVectorStoreIndex.from_documents(documents)
     index.storage_context.persist()