OpenBB-finance/OpenBB · warning · EmptyDataError

The request was returned empty.

Error message

The request was returned empty.

What it means

Raised in FREDYieldCurveFetcher.extract_data (openbb_fred/models/yield_curve.py:76) when the delegated FredSeriesFetcher result is falsy for the requested yield_curve_type ('monthly' or 'daily' fixed Treasury CMT series sets). The code then immediately calls data.result, so this guard mainly protects against a None/empty fetcher response. In practice the more common failure is an empty .result list, which passes this check and surfaces as empty output rather than this error.

Source

Thrown at openbb_platform/providers/fred/openbb_fred/models/yield_curve.py:76

    def transform_query(params: dict[str, Any]) -> FREDYieldCurveQueryParams:
        """Transform query."""
        return FREDYieldCurveQueryParams(**params)

    @staticmethod
    async def aextract_data(
        query: FREDYieldCurveQueryParams,
        credentials: dict[str, str] | None,
        **kwargs: Any
    ) -> list[dict]:
        """Extract data."""
        api_key = credentials.get("fred_api_key") if credentials else ""
        series_ids = ",".join(list(YIELD_CURVES[query.yield_curve_type]))
        fetcher = FredSeriesFetcher()
        data = await fetcher.fetch_data(
            {"symbol": series_ids}, {"fred_api_key": api_key}  # type: ignore
        )
        if not data:
            raise EmptyDataError("The request was returned empty.")
        results = [d.model_dump() for d in data.result]  # type: ignore

        return results

    @staticmethod
    def transform_data(
        query: FREDYieldCurveQueryParams, data: list[dict], **kwargs: Any
    ) -> list[FREDYieldCurveData]:
        """Transform data."""
        # pylint: disable=import-outside-toplevel
        from pandas import Categorical, DataFrame, DatetimeIndex

        df = DataFrame(data).set_index("date").sort_index()
        df.index = df.index.astype(str)
        dates = query.date.split(",") if query.date else [df.index.max()]  # type: ignore
        df.index = DatetimeIndex(df.index)
        dates_list = DatetimeIndex(dates)
        maturity_dict = YIELD_CURVES[query.yield_curve_type]

View on GitHub (pinned to 3e071fcc2c)

Solutions

1. Confirm a valid fred_api_key is configured.
2. Retry after a minute to rule out rate limiting.
3. If the call 'succeeds' but returns no rows, fetch the CMT series directly (e.g. DGS10) via fred_series to confirm availability.

from openbb_core.provider.utils.errors import EmptyDataError

try:
    curve = obb.economy.fred.yield_curve(yield_curve_type=t)
except EmptyDataError:
    curve = None  # degrade gracefully, e.g. serve last cached curve
    curve = load_cached_curve(t)

When it happens

Trigger: economy/fred yield-curve while rate limited such that the internal fetcher returns nothing; a malformed credentials dict leaving api_key empty; unexpected fetcher API changes returning a falsy result object.

Common situations: High-frequency jobs hitting FRED's 50-req/min cap; missing fred_api_key causing the inner series fetch to fail into an empty result.

Related errors

• The request was returned empty.
• Error: No data to plot.
• The request was returned empty.
• "\n".join(messages) # messages contain e.g. 'No data was re
• No data was found for the country, {query.country}, and date

AI-assisted analysis of OpenBB-finance/OpenBB@3e071fcc2c (2026-08-14). Data as JSON: /api/errors/9ee03924e584b90d. Report an issue: GitHub.