OpenBB-finance/OpenBB · error · ValueError

Invalid transform: {t}. Available transforms are: {', '.join

Error message

Invalid transform: {t}. Available transforms are: {', '.join(valid_transforms)}

What it means

Error "Invalid transform: {t}. Available transforms are: {', '.join(valid_transforms)}" thrown in OpenBB-finance/OpenBB.

Source

Thrown at openbb_platform/providers/fred/openbb_fred/models/consumer_price_index.py:52

    def validate_country(cls, c: str):
        """Validate country."""
        result: list = []
        values = c.replace(" ", "_").split(",")
        for v in values:
            if v.lower() not in CPI_COUNTRIES:
                raise ValueError(
                    f"Invalid country: {v}. Available countries are: {', '.join(CPI_COUNTRIES)}"
                )
            result.append(v.lower())
        return ",".join(result)

    @field_validator("transform", mode="before", check_fields=False)
    @classmethod
    def validate_transform(cls, t: str):
        """Validate transform."""
        valid_transforms = ["index", "yoy", "period"]
        if t.lower() not in valid_transforms:
            raise ValueError(
                f"Invalid transform: {t}. Available transforms are: {', '.join(valid_transforms)}"
            )
        return t.lower()


class FREDConsumerPriceIndexData(ConsumerPriceIndexData):
    """FRED Consumer Price Index Data."""


class FREDConsumerPriceIndexFetcher(
    Fetcher[FREDConsumerPriceIndexQueryParams, list[FREDConsumerPriceIndexData]]
):
    """Transform the query, extract and transform the data from the FRED endpoints."""

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

View on GitHub (pinned to 3e071fcc2c)

Solutions

1. Choose a transform from the listed available transforms.
2. Omit the transform parameter to use the default.

When it happens

Trigger: Thrown at openbb_platform/providers/fred/openbb_fred/models/consumer_price_index.py:52 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of OpenBB-finance/OpenBB@3e071fcc2c (2026-08-14). Data as JSON: /api/errors/bca28364b5f0582f. Report an issue: GitHub.