"SetDestination" can only be called on an active agent
Ok, I just skimmed through this thread. From what I can tell, it's due to a scientist on large oil. Did we ever get a fix for this? On my PvP server I just started getting the error every SECOND. It's kind of crazy.
hey found this very old post but i got this error now to on one of my servers 

Since a couple of days I'm gettting the error getting error "SetDestination" can only be called on an active agent that has been placed on a NavMesh

on both of my Rust servers.

First I thought it was a plugin causing it but I still get the error when I unload all plugins.

And I checked but non of my plugins even use this function, could it be something with the latest oxide update?

No, that is from Rust, not Oxide. Merged with existing; see the existing posts above please.
we have a fix for this... been using it for years... here have a discord MikeHawke#9148

Thanks, this was helpful.

I fixed it by disabling and enabling npc's.

ai.npc_enable false -> restart

ai.npc_enable true -> restart