Issue Creating a Property Graph Index

    kg_extractor = SchemaLLMPathExtractor(
        llm = OpenAI(model="gpt-4o", temperature=0.1),
        possible_entities=entities,
        possible_entity_props=entity_properties,
        possible_relations=relations,
        kg_validation_schema=validation_schema,
        strict=True
    )

    graph_store = Neo4jPropertyGraphStore(
        username=os.getenv("username"),
        password=os.getenv("password"),
        url=os.getenv("url"),
        database=os.getenv("database")
    )

    pg_index = PropertyGraphIndex.from_documents(
        documents,
        kg_extractors=[kg_extractor],
        embed_model = OpenAIEmbedding(model="text-embedding-3-small"),
        property_graph_store=graph_store,
        vector_store=None,
        show_progress=True,
    )