Exception raised when an operation requires a Tempo value
anchored to the time line (that is, carrying at least a
year component) but the caller supplied a non-anchored value.
Non-anchored values express a time-of-day axis ("every morning
at 06:00") without a specific location on the time line. Use
Tempo.anchor/2 to compose such a value with a date before
attempting operations that require a UTC projection.