On trying to start a server with the latest NuclearCraft it hit a "No Class Def Found" in trying to startup. There is, apparently, a reference to the client-side I18n functionality (net.minecraft.client.resources.I18n) somewhere in nc.config.NCConfig.syncConfig according to the log.

When I've had a chance to actually get an FTP client connected to that server, I'll download the crash log and upload it here.

In the meantime, the first few lines of the stack dump:

net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from NuclearCraft (nuclearcraft)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/resources/I18n
        at nc.config.NCConfig.syncConfig(NCConfig.java:124)
        at nc.config.NCConfig.syncFromFiles(NCConfig.java:110)
        at nc.config.NCConfig.preInit(NCConfig.java:98)
        at nc.NuclearCraft.preInit(NuclearCraft.java:28)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

I have this issue too.
Hopefully my crashlog will help you.

crash-2017-04-09_12.34.19-server.txt

Yep, my mistake - there are currently two I18n classes in Minecraft, and I rather foolishly went for the wrong one - this should be fixed for the next release :)

Heh, no problem. Ran into this issue myself when trying to clean up all the issues SonarQube/SonarLint pulled up in BaseMetals. Despite the server-side versions being listed as deprecated, there are some places where you have to use them, still.

@turbodiesel4598 Can you send me a 1.10.2 version for my modded server please? I'd be much appreciated since I use bigreactors and since not all the mods I wish to use are 1.11 compatible..

Is there an ETA on this fix for 1.10.2? I was not aware this was an issue, and have a pack waiting on this fix.

I'm about to get a fix up on CurseForge - I'm currently away from home, and TeamViewer's playing up a little, so getting things done is a little fiddly. There are also fixes to the EU emission of the generators and the portable ender chest not opening in 1.10.2. I'm halfway through making some internal changes so once that's done, I'll upload a new build :)

Reaaaaallly looking foward to this update. Thanks for being on top of things.

I've just uploaded a new version that should fix the I18n issue, as well as others: https://minecraft.curseforge.com/projects/nuclearcraft-mod/files

I'll try to get Fission and JEI integration done as fast as possible :)

As far as I can tell, the crash has gone - is everyone else's good now?

No, the release that I have still crashes. It's a different message though.
crash-2017-04-17_21.43.24-client.txt

Unfortunately, as far as I can tell, there is no way for me to fix that crash on my end - the game is looking for some configs that weren't there before or have had their array lengths changed. Deleting the config file should fix the issue.

Despite what I said above, I will look for a fix to the 'config crash'.

Even without the fix, just knowing that I can fix the problem without an update is good. Thanks for your help.

Finally fixed the crash - should not be a problem ever again :)