#26.1.1 Terralith upgrade issue

1 messages · Page 1 of 1 (latest)

dull sierra
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Hey, I'm updating from 1.21.11 to 26.1.1.

I stopped the server, updated Terralith to 2.6.2 and then started the server. The server crashes, but there is no world_gen_settings.dat file.

Logs: https://mclo.gs/U5bm1L1

analog domeBOT
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analog domeBOT
shrewd briar
dull sierra
shrewd briar
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huh, that's odd

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well, send me what seed you're using, and i can recreate the file from scratch

dull sierra
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Yeah I was kinda stumped, tried to restart several times to try to force generate it but no luck

shrewd briar
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actually, should double check - do you have any other worlds in the container?

dull sierra
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Just nether and end

Screenshot_20260405_105830_Firefox.png
shrewd briar
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well, i can still try to recreate it once I know your seed. if it works, then we'll just blame paper jank.

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the part that worries me, is that the error your logs show (which i was expecting) happens when the game reads the world_gen_settings.dat. so I don't know what it's trying to read if that file doesn't exist...

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Long shot, but also just try refreshing your panel, maybe the new files aren't rendering or something

dull sierra
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That's strange, I tried refreshing before and just gave it another go but nothing showing up, I was on my PC earlier but it's the same on my phone now

dull sierra
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Might let Paper know in case it might be a bug. I'm not sure if I can grab the seed since the server isn't started and it's a random one (not in server.properties), but here's my level.dat in case it might be extracted from it

📎 level.dat
shrewd briar
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do you have your old level.dat? the issue is that once the world is upgraded, the seed is moved from level.dat to world_gen_settings.dat

dull sierra
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Yes this is the old one right before upgrade

shrewd briar
dull sierra
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Thank you!

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Something strange is happening

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I renamed and threw it in world/data/minecraft

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When I start the server it crashes in the same way and the file gets wiped

dull sierra
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I checked back with Paper, it looks like this might not be the correct location

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I found a world_gen_settings.dat file in a different location (in the screenshots)

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Should I provide the file that's there if that's the correct generated one?

shrewd briar
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(and wtf paper, why make this so complicated)

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but yeah, if you found it, just replace that file with the one I send (take a backup of it first)

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I'm 90% sure what I sent will still work; exception being if Paper does anything weird to it

dull sierra
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It's at this path: world/dimensions/minecraft/overworld/data/minecraft

Screenshot_20260406_073635_Firefox.png
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Thank you I'll be giving that a shot

dull sierra
analog domeBOT
# dull sierra Looks like it couldn't read the new world_gen_settings.dat file and crashed, pro...
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I've taken a glance at your logs. Here are some potential issues I found!

How was my response? Let me know!
dull sierra
shrewd briar
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anyway, I won't be able to edit it for a while, I am currently away from my machine. So curious if you can test something.

Take a backup if you haven't already. Then for every dimension in your world/dimensions folder, find every world_gen_settings.dat file, and replace it with the one I gave you

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knowing Paper, they are probably exact duplicates, so all of them have the precisely same issue, and can be fixed with replacing each

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if it doesn't work, then I can take a look and edit the files you just sent, once I get back to my machine

dull sierra
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I don't think they exist yet for other dimensions, should I replace anyway?

shrewd briar
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only if they exist

dull sierra
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It doesn't look like it, at both of these locations

Screenshot_20260406_090111_Firefox.png Screenshot_20260406_090209_Firefox.png
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(same for Nether assuming it's in world_nether/DIM-1/data)

shrewd briar
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Oh wait, I actually read your logs, it's a different issue now

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For some reason the game doesn't like reading Endercon's data, and I'm not sure why

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easy fix tho, can do as soon as I get back

dull sierra
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No worries take your time thank you, I'll be able to check back later today

analog domeBOT
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Reminder successfully created! I will ping you in 8h with your reminder.

shrewd briar
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Honestly not sure why your logs are complaining about Endercon, Endercon's data looks perfectly fine, but whatever, I made it see what it is expecting to see

analog domeBOT
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Hey @shrewd briar!

Reminder

fix

dull sierra
analog domeBOT
shrewd briar
dull sierra
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No worries! Testing this now

analog domeBOT
dull sierra
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So now I noticed there's a new folder for the nether

image.png
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It also contains a world_gen_settings.dat file, however none in the_end yet

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Should I try replacing the file above in both overworld and nether?

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I did just that and it crashed, I think I'm on the right path though, there should probably be one for the_end now and I'll repeat the same

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Ok, did the same for the_end. It looks like I just had to wait for it to crash for each dimension so the file is generated for that dimension, and then replace the file for that dimension

shrewd briar
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but glad it's working now

dull sierra
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It looks like all worlds/dimensions have been moved to the same folder, and they're now located here

firefox_zRvk2PbbcB.png firefox_rPNWH3goAj.png
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Thank you very much for the help, much appreciated hypersLB

shrewd briar
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Awesome! And it was very helpful for me, as this is the first time I've witnessed a Paper-like server update from 1.21.11 to 26.1