grafana/k6 · error

the 'header' option cannot be enabled when 'skipFirstLine' i

Error message

the 'header' option cannot be enabled when 'skipFirstLine' is true

What it means

Error "the 'header' option cannot be enabled when 'skipFirstLine' is true" thrown in grafana/k6.

Source

Thrown at internal/js/modules/k6/experimental/csv/reader.go:141

		}

		return recordMap, nil
	}

	return record, nil
}

// validateOptions validates the reader options and returns an error if any validation fails.
func validateOptions(options options) error {
	var (
		fromLineSet      = options.FromLine.Valid
		toLineSet        = options.ToLine.Valid
		skipFirstLineSet = options.SkipFirstLine
		asObjectsEnabled = options.AsObjects.Valid && options.AsObjects.Bool
	)

	if asObjectsEnabled && skipFirstLineSet {
		return fmt.Errorf("the 'header' option cannot be enabled when 'skipFirstLine' is true")
	}

	if asObjectsEnabled && fromLineSet && options.FromLine.Int64 > 0 {
		return fmt.Errorf("the 'header' option cannot be enabled when 'fromLine' is set to a value greater than 0")
	}

	if fromLineSet && options.FromLine.Int64 < 0 {
		return fmt.Errorf("the 'fromLine' option must be greater than or equal to 0; got %d", options.FromLine.Int64)
	}

	if toLineSet && options.ToLine.Int64 < 0 {
		return fmt.Errorf("the 'toLine' option must be greater than or equal to 0; got %d", options.ToLine.Int64)
	}

	if fromLineSet && toLineSet && options.FromLine.Int64 >= options.ToLine.Int64 {
		return fmt.Errorf(
			"the 'fromLine' option must be less than the 'toLine' option; got 'fromLine': %d, 'toLine': %d",
			options.FromLine.Int64, options.ToLine.Int64,

View on GitHub (pinned to 93accf6570)

When it happens

Trigger: Thrown at internal/js/modules/k6/experimental/csv/reader.go:141 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of grafana/k6@93accf6570 (2026-08-15). Data as JSON: /api/errors/db061050fc70b34e. Report an issue: GitHub.