"SetDestination" can only be called on an active agent
If killing a standard scientist on the Large Oilrig solves this, I can't imagine it having anything to do with Oxide. Is this happening to servers without Oxide?
pretty much what the title says. it just spams i would say about a 100 times 

Failed to create agent because it is not close enough to the NavMesh

(Filename: Line: 648)

any way to fix this?

EDIT: It is also before that putting "

"SetDestination" can only be called on an active agent that has been placed on a NavMesh.

"
a couple of times
In response to ():
Getting moderated like a champ, there? :P

idk. Hands up if you're having this issue and n...
I am having the same error and do not use botspawn
In response to calinova22 ():
I am having the same error and do not use botspawn
The given solution should still work for you. Kill that one scientist on the large oil rig as noted earlier in the thread. 
In response to Philoludos ():
The given solution should still work for you. Kill that one scientist on the large oil rig as noted...
yea sorry thats a very short term solution... like 15-30min solution. sorry I dont have time 48+ times a day to fly out there and find one damn scientist
In response to Razor14150 ():
yea sorry thats a very short term solution... like 15-30min solution. sorry I dont have time 48+ tim...
I did it once, a few days ago, and I haven't had the error since. It's showing up again for you? 
From what i can gather this is related to the scientist on the oil rig, i as well had the errors , ive updated all plugins and checked everything.

Killing the floating scitentist on the oil rig does clear the error for now.

This appears to be a Facepunch sided error.

How to Filter the error? Seems that there's no fix at this moment

You know if your toilet is broken you can crap in your hand and walk it outside. But I would rather fix the toilet.
In response to calinova22 ():
You know if your toilet is broken you can crap in your hand and walk it outside. But I would rather...
HAHAHA. This made me literally laugh out loud. 
Still not fixed on my servers... Note that I help run 8 servers with all diffrent map seeds.... Every restart this error pops up... guess what my 8 servers restart every 12hr... no... just no.

As a temp solution to the RCON spam I just set RustAdmin to filter out the "SetDestination" lines so I can see actally needed things
dont know if this is related, but on one server i simply updated this event randomizer plugin and it seems to have fixed the issue:
https://umod.org/plugins/event-randomizer#updates

if you guys also use that plugin and havent updated it im wondering if it was the plane caught in a low spawn causing this.

Seems fixed for me for now.

Merged post

Update and it's back! XD dang it
In response to Razor14150 ():
Still not fixed on my servers... Note that I help run 8 servers with all diffrent map seeds.... Ever...
Killing the scientist didn't work for you? I've restarted my server a few times and it hasn't come back. 
Update - I haven't seen the error but like 1 time for 1 restart in the last few days.