VectorstoreIndex save and load

[nat890194]

Hi,

We are trying to save the index like this:
from langchain.indexes import VectorstoreIndexCreator index = VectorstoreIndexCreator(vectorstore_kwargs={'persist_directory': 'some_dir'}).from_loaders([loader])
It can run but in the folder all the save file shows the error:

Error! file_name is not UTF-8 encoded
Saving disabled.
See Console for more details.
Also, I am wondering how to load the index without training again (ex: text from .pdf)?

Thanks in advance!!