{"record":{"id":"f6c46164c45e5893","repo":"langchain-ai/langgraph","slug":"no-cache-is-set-for-this-graph-cannot-clear-cache","errorCode":null,"errorMessage":"No cache is set for this graph. Cannot clear cache.","messagePattern":"No cache is set for this graph\\. Cannot clear cache\\.","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"libs/langgraph/langgraph/pregel/main.py","lineNumber":4139,"sourceCode":"                    chunks.append(chunk)\n\n        if stream_mode == \"values\":\n            if version == \"v2\":\n                return GraphOutput(value=latest, interrupts=tuple(interrupts))\n            if interrupts:\n                return (\n                    {**latest, INTERRUPT: interrupts}\n                    if isinstance(latest, dict)\n                    else {INTERRUPT: interrupts}\n                )\n            return latest\n        else:\n            return chunks\n\n    def clear_cache(self, nodes: Sequence[str] | None = None) -> None:\n        \"\"\"Clear the cache for the given nodes.\"\"\"\n        if not self.cache:\n            raise ValueError(\"No cache is set for this graph. Cannot clear cache.\")\n        nodes = nodes or self.nodes.keys()\n        # collect namespaces to clear\n        namespaces: list[tuple[str, ...]] = []\n        for node in nodes:\n            if node in self.nodes:\n                namespaces.append(\n                    (\n                        CACHE_NS_WRITES,\n                        (identifier(self.nodes[node]) or \"__dynamic__\"),\n                        node,\n                    ),\n                )\n        # clear cache\n        self.cache.clear(namespaces)\n\n    async def aclear_cache(self, nodes: Sequence[str] | None = None) -> None:\n        \"\"\"Asynchronously clear the cache for the given nodes.\"\"\"\n        if not self.cache:","sourceCodeStart":4121,"sourceCodeEnd":4157,"githubUrl":"https://github.com/langchain-ai/langgraph/blob/38031739e551638e373fb553453256c23feeb41f/libs/langgraph/langgraph/pregel/main.py#L4121-L4157","documentation":"Error \"No cache is set for this graph. Cannot clear cache.\" thrown in langchain-ai/langgraph.","triggerScenarios":"Thrown at libs/langgraph/langgraph/pregel/main.py:4139 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"38031739e551638e373fb553453256c23feeb41f","analyzedAt":"2026-08-26T18:02:49.312Z","schemaVersion":2},"datasetVersion":"2026-08-26T21:11:00.512Z"}