{"record":{"id":"99ebc73cfc666d16","repo":"run-llama/llama_index","slug":"parser-loading-requires-a-class-name","errorCode":null,"errorMessage":"Parser loading requires a class_name","messagePattern":"Parser loading requires a class_name","errorType":"exception","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"llama-index-core/llama_index/core/node_parser/loading.py","lineNumber":38,"sourceCode":"    JSONNodeParser.class_name(): JSONNodeParser,\n    MarkdownNodeParser.class_name(): MarkdownNodeParser,\n    SimpleFileNodeParser.class_name(): SimpleFileNodeParser,\n    HierarchicalNodeParser.class_name(): HierarchicalNodeParser,\n    CodeSplitter.class_name(): CodeSplitter,\n    SentenceSplitter.class_name(): SentenceSplitter,\n    TokenTextSplitter.class_name(): TokenTextSplitter,\n    SentenceWindowNodeParser.class_name(): SentenceWindowNodeParser,\n}\n\n\ndef load_parser(\n    data: dict,\n) -> NodeParser:\n    if isinstance(data, NodeParser):\n        return data\n    parser_name = data.get(\"class_name\")\n    if parser_name is None:\n        raise ValueError(\"Parser loading requires a class_name\")\n\n    if parser_name not in all_node_parsers:\n        raise ValueError(f\"Invalid parser name: {parser_name}\")\n    else:\n        return all_node_parsers[parser_name].from_dict(data)\n","sourceCodeStart":20,"sourceCodeEnd":44,"githubUrl":"https://github.com/run-llama/llama_index/blob/afd0fef371831f9bda13e5af7167cf4e981278ab/llama-index-core/llama_index/core/node_parser/loading.py#L20-L44","documentation":"Error \"Parser loading requires a class_name\" thrown in run-llama/llama_index.","triggerScenarios":"Thrown at llama-index-core/llama_index/core/node_parser/loading.py:38 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Include class_name in the serialized parser data.","Re-serialize the parser with its class name before loading."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"afd0fef371831f9bda13e5af7167cf4e981278ab","analyzedAt":"2026-08-15T05:42:58.429Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}