UndefVarError: _throw_dmrs not defined but "_throw_dmrs" is nowhere in my code

What does this error mean? It happens in the context of a NLsolve but I have no idea what “_throw_dmrs” is.

There’s not enough information to really help here (the whole stacktrace would be much more helpful), but searching JuliaHub indicates that this appears in Julia and a few packages:

https://juliahub.com/ui/Search?type=code&q=_throw_dmrs&r=true