Obscure error message in the formatting API

[dkhalanskyjb]

Reported to us in private.

    private val readableFormat = DateTimeComponents.Format {
        year()
        char('-')
        monthNumber()
        char('-')
        dayOfMonth()
        char(' ')
        hour()
        char(':')
        minute()
        char(':')
        second()
        alternativeParsing({}) {
            char(' ')
        }
        alternativeParsing(
            { timeZoneId() },
            { offset(UtcOffset.Formats.ISO) }
        ) {
            offsetHours()
            char(':')
            offsetMinutesOfHour()
            optional {
                char(':')
                offsetSecondsOfMinute()
            }
        }
    }

    public fun format(value: Instant): String {
        return readableFormat.format {
            setDateTime(value.toLocalDateTime(zone))
            timeZoneId = zone.id
        }
    }

The error message is unreadable:

java.lang.IllegalStateException: Field totalHoursAbs is not set