Modpack version
1.63a

Can the issue be reproduced?
Yes

Logs
https://pastebin.com/djMBU20Z (server log, SMP)
https://pastebin.com/ny9T50gz (server log, SP)

Issue
When using mekanism gas channels, the server crashes as soon as gas is moved (the entity is ticked). This is most likely caused by the update to the new backwards-compatibility breaking versions of McJty's mods; YNot hasn't seen an update in a year (according to GitHub) and so probably isn't compatible.

Xnet's commit that broke this is this: McJtyMods/XNet@bad2273#diff-ccdebad88af10ecb4fad7ab360007b5e

YNot should be updated to link to mcjty.xnet.config.ConfigSetup instead of GeneralConfiguration, but I can't seem to find the source code for 0.2.3, only 0.2.2 is available on GitHub, otherwise I'd fork it and fix it myself :-).

Debugged this with @stefancdr. This issue caused our server to crash when updating from 1.62 to 1.63(a).

In case any other server admin bumps into this; simply change the forge.cfg file to set the "removeErroringTileEntity" flag to true. This will remove the issue-throwing Xnet connectors and get your server started again.

Please do note that this might influence other stuff as well if you have any other tile entities that are being a dick. So be sure to have a backup of your server!

Just found the correct repo for Ynot @ https://git.asie.pl/asie-minecraft/YNot

I might look into this tomorrow and see if we can get a fix in place and PR'ed

asie's git server

YNot

Compatibility add-on for XNet? YNot!

Great work!

Pull request made (asiekierka/YNot#13), let's hope I didn't make any silly coding mistakes. (this version works locally)

0.2.4 is now available :-).