After issuing the command datareftool/reload_plugins, FlyWithLua's plugin restarts properly, but the Lua interpreter stops with this error reported only on screen (no trace on Log.txt file):
[string "FLYWITHLUA_DEBUG()"]:1 attempt to call global "FLYWITHLUA_DEBUG" (a nil value)
Manually forcing FWL to reload all scripts, solves the problem.
I've tested without any script installed, to be sure not to have any possible interference.
Best.