We saw this crash once before in beta, dont remember how we fixed it but some people are reporting this again but it doesnt happen for everyone, I myself can't reproduce it.

https://hastebin.com/vowojevoca.sql

content of fluid rarities file:

data {
    S:data <
        oil;4000000000;1000000000;7500
     >
}

I'm seeing this as well in FTB Interactions whenever I create a new world:
https://pastebin.com/55229vZ7

I'm experiencing this as well. FTB interactions 1.2 server boots up fine when creating a new world but crashes with the below error when trying to load my FTB interactions 1.0.1 world.

https://gist.github.com/brad18/1e5708a2e7f461662c3aef4babaac510

FTB Interactions upgraded from 1.1.2 to 1.2.0, was fine for a bit, started exploring and now world crashes on load.

https://paste.feed-the-beast.com/view/0ee538e4

Server-side crash after we upgraded FTB Interactions to 1.2.0

https://gist.github.com/kynapse/146839ea62cf8f9a872b7fb68ec5162e

Updated from 1.0.1 to 1.2.0 beta. Crashes when entering world.

crash-2019-04-11_17.48.14-server.txt

https://paste.feed-the-beast.com/view/6fbb61bc
server crash playing ftb interactions after updating to 1.2.0

crash-2019-04-11_15.50.15-server.txt
crashes when entering world but no the first time. it started when i went to the overworld via overworld portal

https://pastebin.com/90SvtCSr
Game and server crashed after entering the overworld from the voidworld. Server now crashes on login. One of the attempts showed some loaded chunks in the overworld for about a second, followed by server crash.

Edit: I believe the chunks I saw loaded were ones I have always loaded
Edit 2: I replaced fluid_rarities.cfg with the one from 1.12 and I am no longer experiencing issues.

May be related to certain numbers in AS fluid_rarities.cfg being larger than max int.

Setting values down to maxint allowed the player near the affected chunk to rejoin again without crashing.

If others could confirm Kanzuke117's config change works on their side, could be helpful.

it seems the config file here fixed it when replaced
fluid_rarities.cfg.txt

Kanzuke117's config change works for me.

Can confirm that capping it at maxint stopped the world from crashing on join.

Kanzuke has saved our server, all is fixed now because of him.

Can confirm issue is resolved after changing line 12 from fluid_rarities.cfg file.

Before:
oil;4000000000;1000000000;7500
After:
oil;4000000;1000000;7500

You can replace the file from below path with the one attached after removing .txt extension.
Local:
C:\Users%username%\Documents\Curse\Minecraft\Instances\FTB Interactions\config\astralsorcery
Server:
FTBInteractionsServer_1.2.0\config\astralsorcery\

fluid_rarities.cfg.txt

Before we all comment "same" or "thanks, fixed it for me too":

The first and 2nd number added together must not exceed 2147483647. That's the whole "magic" behind the fix. So adjust the numbers as you see fit or wait for a FTB Interactions update.

Please refrain from adding more "same" or "that fixed it for me" comments.
Thank you.

this was actually a simple typo, the numbers should quite literally both have one less zero. There will be a hotfix for ftbi soon, meanwhile we will have the corrected rarities file posted in the FTB official discord