@d-healey yeah it must be that particular effect.
a tried an even simpler delay and it compiled and worked!
seems so odd. works on mac but not on windows.
it was just the smooth delay i am using found here:
https://faustdoc.grame.fr/examples/delayEcho/#smoothdelay
that is throwing the error.
doesnt seem that complicated but that is the problem.
Ill try to smooth out the other delay that works with some smoothing nodes in scriptnode to try to match my mac version i guess.