run-llama/llama_index · error · ValueError

Invalid mode: {self.mode}

Error message

Invalid mode: {self.mode}

What it means

Error "Invalid mode: {self.mode}" thrown in run-llama/llama_index.

Source

Thrown at llama-index-core/llama_index/core/postprocessor/node.py:203

        query_bundle: Optional[QueryBundle] = None,
    ) -> List[NodeWithScore]:
        """Postprocess nodes."""
        all_nodes: Dict[str, NodeWithScore] = {}
        for node in nodes:
            all_nodes[node.node.node_id] = node
            if self.mode == "next":
                all_nodes.update(get_forward_nodes(node, self.num_nodes, self.docstore))
            elif self.mode == "previous":
                all_nodes.update(
                    get_backward_nodes(node, self.num_nodes, self.docstore)
                )
            elif self.mode == "both":
                all_nodes.update(get_forward_nodes(node, self.num_nodes, self.docstore))
                all_nodes.update(
                    get_backward_nodes(node, self.num_nodes, self.docstore)
                )
            else:
                raise ValueError(f"Invalid mode: {self.mode}")

        all_nodes_values: List[NodeWithScore] = list(all_nodes.values())
        sorted_nodes: List[NodeWithScore] = []
        for node in all_nodes_values:
            # variable to check if cand node is inserted
            node_inserted = False
            for i, cand in enumerate(sorted_nodes):
                node_id = node.node.node_id
                # prepend to current candidate
                prev_node_info = cand.node.prev_node
                next_node_info = cand.node.next_node
                if prev_node_info is not None and node_id == prev_node_info.node_id:
                    node_inserted = True
                    sorted_nodes.insert(i, node)
                    break
                # append to current candidate
                elif next_node_info is not None and node_id == next_node_info.node_id:
                    node_inserted = True

View on GitHub (pinned to afd0fef371)

Solutions

1. Set self.mode to a supported value before postprocessing.
2. Use one of the documented modes for this node postprocessor.

When it happens

Trigger: Thrown at llama-index-core/llama_index/core/postprocessor/node.py:203 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of run-llama/llama_index@afd0fef371 (2026-08-15). Data as JSON: /api/errors/73dc09f6ba0c42f7. Report an issue: GitHub.