Trying to make a server with Diversity 3 map FreeNAS 11.3-U1

Trying to get a Diversity server running on my FreeNAS box.

Starting server, stops in 10 seconds or so, error report reads:

---- Minecraft Crash Report ----
// Uh… Did I do that?

Time: 5/11/20 1:24 AM
Description: Exception in server tick loop

java.lang.RuntimeException: Failed to check session lock, aborting
at coo.h(SourceFile:95)
at coo.(SourceFile:51)
at coq.a(SourceFile:113)
at coq.a(SourceFile:109)
at net.minecraft.server.MinecraftServer.a(SourceFile:352)
at uk.d(SourceFile:218)

A detailed walkthrough of the error, its code path and all known details is as follows:

– System Details –
Minecraft Version: 1.14.4
Minecraft Version ID: 1.14.4
Operating System: FreeBSD (amd64) version 11.3-RELEASE-p6
Java Version: 1.8.0_252, Oracle Corporation
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 3028633976 bytes (2888 MB) / 4116709376 bytes (3926 MB) up to 4116709376 bytes (3926 MB)
CPUs: 4
JVM Flags: 2 total; -Xmx4096M -Xms4096M
Player Count: 0 / 5; []
Data Packs:
Is Modded: Unknown (can’t tell)
Type: Dedicated Server (map_server.txt)

I had this same issue, the permissions of the world file are probably wrong (i fixed it with a chown command in the shell)