https://pastebin.com/5wnb42jV

Description: Exception ticking world

java.lang.NoClassDefFoundError: net/minecraft/world/World$2

Space world with SingleBiome on in LostCities, never happened before when creating other world.

Tried making another world, same crash https://pastebin.com/RDp35men
Custom profile used https://pastebin.com/zzm6jmNu , named profile_space_empty.cfg, using LostCitesBOP in single player.
Will try another profile, but I made some world earlier and didn't crash, but I wasn't in Creative flying fast.

The last line in the OreSpawn code is a call to "world.setBlockState" - let me go see if @McJty has any ideas on what causes this.

Manage to get another crash with the Space profile, but with no mention of OreSpawn, just BoP, so it must be on LostCities side.
I didn't get to make it crash with my custom non-sphere profile though.

McJty hasn't responded yet, but I've seen similar crashes in the past where a neighbor change spread quite a bit out - usually accompanied by chunkgen lag warnings

Here is a Minutor render of the last map that crashed, I was in the "tube" toward the upper left corner when MC stopped responding, and popped a crash file in the folder, without closing.

As we can see, there is no "chunk branch" in this one, if it's what you are talking about
Sadly I already deleted the logs folder :(

It is crashing in oreSpawn as far as I can see. Best to report to them as well

@drakray what version of Lost Cities are you using? It's not in the mod-list provided with the crash log and could have the information needed to figure this out

Lost Cities 2.0.5

Yes but neither does it mention Lost Cities

yeah I know, that's why I posted it in OreSpawn first, but after a couple of quick test, I only got this in Lost Cities Space profile, not even in "normal" profile :/
Also, it's fairly recent, because couple days/week ago, I created Space map with no problem, first time I got this was yesterday

hrm... common thread in the crashes is that "markAndNotify" is in the chain - is it possible that one of the blocks getting the notification is erroring ?

As mentionned on the LostCities Curse page, I tried setting fixVanillaCascading to false(was on true), to no avail
Here is the latest crashLog, with complete log folder, and a Minutor render of the map, I was in the upper right corner when it crashed this time, and it took longer than the last 2 time before crashing.
In fml-junk-earlystartup.log, near line 80350, is the start of crashy info I think

There it is - it got into a recursive loop. Had issues like that early in the OreSpawn 3 development cycle and had to implement a check to make sure that we only ran a given event handler a limited number of times... I think that was it - been a while since I ran into that.

Basically... it's a really, really tricky area of the code and it looks like Lost Cities BOP is getting into a bit of recursion, from the stack trace.

@McJty this crash have no mention of Orespawn in it though

Any time you get a java.lang.NoClassDefFoundError: net/minecraft/world/World$2, the real cause and stack trace is lost. I opened MinecraftForge/MinecraftForge#4769 about this. For debugging, you can mitigate this by calling Class.forName("net/minecraft/world/World$2") (and also for any other classes that this happens for) somewhere before things go badly. This is fixed now, so use Forge 2620 or above if you want to see the real stack trace.

@josephcsible I tried using 2620 on my crashy settings, but now instead of a silentCrash, the worldgen just stop, I can still move and open inventory, but the chat/command doesn't respond, and if I get far enough from where I was when the worldGen stopped, I can seemingly pass through wall/glass bubble.
No info in log, no crash
Lag started at ~22:17, killed the process around ~22:45

We've got a new version on the Maven and this might have been related to a JSON Parse error, in the end. Could you test and see ?

debug.log
latest.log
Log stop at 10:46, killed process at 10:53 because worldGen stopped and couldn't open door/chest/Bauble inventory
w/ latest version of everything on date and forge 2631

Hrm... can you try with the freshly released OreSpawn 3.3.0 and let me know if this still occurs ?

Just did some testing and flying around in a Lost Cities space generation world and have not been able to trigger a crash at all. Closing as resolved in an intervening version.