Hi! I am on llamaindex latest version and when doing one of the examples, https://docs.llamaindex.ai/en/stable/examples/retrievers/composable_retrievers.html, I receive an error: ValueError: IndexNode obj is not serializable: <llama_index.core.indices.vector_store.retrievers.retriever.VectorIndexRetriever object at ... . My vector_index is loaded from an WeaviateVectorStore. Can you please help? Thanks!
