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• This is a crash. Please upload, Pastebin, Gist or copypaste the whole crash report along with this issue.

• This is a mod incompatibility. If I do this in vanilla Forge with only Et Futurum Requiem installed, it works normally.

Version number of Et-Futurum-Requiem (IMPORTANT)

Et_Futurum_Requiem-2.4.5.jar

Describe the issue (IMPORTANT)

Log: https://pastebin.com/W2r03tSn

Hopefully(?) the modlist I'm using can explain this, but the server crashes before starting on Aternos.org, no tweaks to the server files done, just installing the mods off their mod browser.

I have searched for a similar error, and found one for other items such as 'dark oak mineshafts' with the instruction to disable them (I wouldn't know how, but doesn't appear in error). There is also a mention of BlockDeepslateOre crashing a server, but that was fixed in an earlier version.

TerraFirmaCraft+ is not incompatible with this (there's a modpack that pairs the two together).

[14:04:34] [Server thread/ERROR] [FML/]: Caught exception from etfuturum

824 | java.lang.NoSuchMethodError: net.minecraft.block.Block.func_149708_J()Lnet/minecraft/creativetab/CreativeTabs;
825 | at ganymedes01.etfuturum.blocks.ores.BlockDeepslateOre.setAttribs(BlockDeepslateOre.java:49) ~[BlockDeepslateOre.class:?]
826 | at ganymedes01.etfuturum.blocks.ores.BlockDeepslateOre.(BlockDeepslateOre.java:35) ~[BlockDeepslateOre.class:?]

Mod list (OPTIONAL)

UCH mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)

810 | UCH FML{...} [Forge Mod Loader] (forge.jar)
811 | UCH Forge{10.13.4.1614} [Minecraft Forge] (forge.jar)
812 | UCH tfc_coremod{0.89.1} [TFC[coremod]] (minecraft.jar)
813 | UCH FoamFixCore{1.0.4} [FoamFixCore] (minecraft.jar)
814 | UCH FastCraft{1.25} [FastCraft] (fastcraft-1.25.jar)
815 | UCH terrafirmacraftplus{0.89.1} [TerraFirmaCraft+] ([1.7.10]TerraFirmaCraftPlus-0.89.1.jar)
816 | UCH aiimprovements{...} [AI Improvements] (AIImprovements-1.7.10-0.0.1b8.jar)
817 | UCH ChunkPurge{2.1} [Chunk Purge] (ChunkPurge-1.7.10-2.1.jar)
818 | UCH damagetilt{0.1.0} [Damage Tilt] (DamageTilt-1.7.10-0.1.0.jar)
819 | UCE etfuturum{2.4.5} [Et Futurum Requiem] (Et_Futurum_Requiem-2.4.5.jar)
820 | UCH foamfix{@Version@} [FoamFix] (FoamFix-1.7.10-universal-1.0.4.jar)
821 | UCH skinport{1.7.10-v10d} [SkinPort] (SkinPort-1.7.10-v10d.jar)

Additional Context (OPTIONAL)

Log: https://pastebin.com/W2r03tSn

Mojang uses a Compiler that automatically marks those things, resulting in some very useful functions being Clientside only for no discernible reason.

However Creative Tab info being Clientside Only is normal, and you should've known that. :P

The field itself is not.

Anyways the person who chose to do that automatically is still guilty, strangling imminent

func_149708_J = getCreativeTabToDisplayOn (client-only)

If that's Et Futurum, then I'll have to see which config file that setting is in, if it is.

FWIW, I also installed a later version (but still 1.7.10) of AI Improvements that caused a crash on it's own when Et Futurum Requiem was removed, so I went back to version 19 which I used for single player, and server starts.

Oh, I just meant that as a note to Roadhog. The deepslate ore's code calls a client-only method during its initialization. I think this would happen even with no other mods. So the only workaround for now is to disable deepslate.

I am going to strangle whoever marked these functions as client-sided for no reason, mark my words