FLX-7003: prediction id is not a safe identifier
Family: calibration (the 7000 band)
A prediction_id names a file under the state directory, so it must be one path component drawn from the FLUX identifier grammar ([A-Za-z0-9_][A-Za-z0-9_.-]*[A-Za-z0-9_]): no slashes, no leading dot, no empty value. A document carrying any other spelling is refused before anything is written.
Look it up offline
$ fluxsim explain FLX-7003
Every code is listed in the error index.