docker/cli · error

invalid type %T for service volume

Error message

invalid type %T for service volume

What it means

Error "invalid type %T for service volume" thrown in docker/cli.

Source

Thrown at cli/compose/loader/loader.go:769

var transformBuildConfig TransformerFunc = func(data any) (any, error) {
	switch value := data.(type) {
	case string:
		return map[string]any{"context": value}, nil
	case map[string]any:
		return data, nil
	default:
		return data, fmt.Errorf("invalid type %T for service build", value)
	}
}

var transformServiceVolumeConfig TransformerFunc = func(data any) (any, error) {
	switch value := data.(type) {
	case string:
		return volumespec.Parse(value)
	case map[string]any:
		return data, nil
	default:
		return data, fmt.Errorf("invalid type %T for service volume", value)
	}
}

var transformServiceNetworkMap TransformerFunc = func(value any) (any, error) {
	if list, ok := value.([]any); ok {
		mapValue := map[any]any{}
		for _, name := range list {
			mapValue[name] = nil
		}
		return mapValue, nil
	}
	return value, nil
}

var transformStringOrNumberList TransformerFunc = func(value any) (any, error) {
	list := value.([]any)
	result := make([]string, len(list))
	for i, item := range list {

View on GitHub (pinned to e9452d6e78)

When it happens

Trigger: Thrown at cli/compose/loader/loader.go:769 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of docker/cli@e9452d6e78 (2026-08-01). Data as JSON: /data/errors/0902a8bbf803d1ec.json. Report an issue: GitHub.