FLX-5021: draw parameter outside its declared domain
Family: numerics (the 5000 band)
A kernel sampler was asked for a draw it cannot form -- a probability outside [0, 1], a non-positive rate, a bound below 1, an interval whose lower end is above its upper end, or a scale on which no value of the declared interval is representable. The kernel refuses rather than substituting a default, because the substituted value would be hashed into the run digest and no reader could tell it apart from an authored one (KERNEL-SPEC §4).
Look it up offline
$ fluxsim explain FLX-5021
Every code is listed in the error index.