hello I am trying to execute the command / zone safezone true but it tells me that this flag is invalid

works for me.
/zone_edit
/zone safezone true

-->

Thats weird indeed :o

Same,, Get the same message. Plugin fully updated

I managed to get it to work, but with SafeZone set to True. It causes all cars, helis etc to be destroyed

Have ya'll executed a reload? oxide.reload ZoneManager ??

It will reload automatically when you insert the new .cs file

Fair, I find sometimes it's good to force a reload and change up a number in the file to make it autowrite over it and fix w/e is wrong.