rohitg00/ai-engineering-from-scratch · error · ValueError

registry root must be an object

Error message

registry root must be an object

What it means

Error "registry root must be an object" thrown in rohitg00/ai-engineering-from-scratch.

Source

Thrown at certifications/claude/lessons/04-context-knowledge-memory-and-caching/code/main.py:95

        "cachedPrefix": [source["id"] for source in registry["sources"] if source["id"] in cached],
        "dynamicContext": [source["id"] for source in registry["sources"] if source["status"] == "active" and source["id"] not in cached],
        "retired": [source["id"] for source in registry["sources"] if source["status"] != "active"],
        "budgetRemaining": registry["promptBudget"]["maximumTokens"] - sum(value for key, value in registry["promptBudget"].items() if key != "maximumTokens"),
    }


def _iso_date(value: Any) -> bool:
    try:
        date.fromisoformat(value)
        return isinstance(value, str)
    except (TypeError, ValueError):
        return False


def load_registry(path: Path) -> dict[str, Any]:
    value = json.loads(path.read_text(encoding="utf-8"))
    if not isinstance(value, dict):
        raise ValueError("registry root must be an object")
    return value


if __name__ == "__main__":
    path = Path(__file__).parents[1] / "outputs" / "context-registry.json"
    registry = load_registry(path)
    print(json.dumps({"valid": not validate_registry(registry), "plan": build_context_plan(registry)}, indent=2))

View on GitHub (pinned to 39ea8a1c6d)

When it happens

Trigger: Thrown at certifications/claude/lessons/04-context-knowledge-memory-and-caching/code/main.py:95 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of rohitg00/ai-engineering-from-scratch@39ea8a1c6d (2026-08-26). Data as JSON: /api/errors/34127317f76b19b9. Report an issue: GitHub.