run-llama/llama_index · error · ValueError

Could not parse code with language {self.language}.

Error message

Could not parse code with language {self.language}.

What it means

Error "Could not parse code with language {self.language}." thrown in run-llama/llama_index.

Source

Thrown at llama-index-core/llama_index/core/node_parser/text/code.py:315

        ) as event:
            text_bytes = bytes(text, "utf-8")
            tree = self._parser.parse(text_bytes)

            if (
                not tree.root_node.children
                or tree.root_node.children[0].type != "ERROR"
            ):
                chunks = [
                    chunk.strip()
                    for chunk in self._chunk_node(tree.root_node, text_bytes)
                ]
                event.on_end(
                    payload={EventPayload.CHUNKS: chunks},
                )

                return chunks
            else:
                raise ValueError(f"Could not parse code with language {self.language}.")

        # TODO: set up auto-language detection using something like https://github.com/yoeo/guesslang.

View on GitHub (pinned to afd0fef371)

Solutions

1. Verify the language parameter matches a supported tree-sitter grammar.
2. Check the code is valid for the configured language; fall back to SentenceSplitter for unparseable input.

When it happens

Trigger: Thrown at llama-index-core/llama_index/core/node_parser/text/code.py:315 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/f60f66299cc1209e. Report an issue: GitHub.