net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from Nether Metals (nethermetals) Caused by: java.lang.NoSuchMethodError: com.mcmoddev.nethermetals.init.ItemGroups.addTab(Ljava/lang/String;Z)I
https://pastebin.com/Tq0YBm0F
MC 1.12.2
Forge 2618
(new)OreSpawn-1.12-3.2.2.113.jar (was 112)
(new)BaseMetals-1.12-2.5.0-beta4.146.jar (was 137)
(new)ModernMetals-1.12-2.5.0-beta4.91.jar (was 87)
(new)BaseMinerals-1.12-2.5.0-beta4.27.jar (was 23)
NetherMetals-1.12-1.2.0-beta1.32.jar
EndMetals-1.12-1.2.0-beta1.22.jar
Was working before update

EDIT: MMDBucket and EndMetal are also showing UCE in the log

Can confirm that this is occurring with me too, I also have end metals crashing with nether metals. I don't understand why these two mods were excluded from all other other base metal mod updates (modern, minerals, base, etc.) btw, here's a crash report of my own if it helps: here

Fixed inDev with
AdditionalLootTables-1.12-2.0.3.37
OreSpawn-1.12-3.2.2.114
BaseMetals-1.12-2.5.0-beta4.155
BaseMinerals-1.12-2.5.0-beta4.27
ModernMetals-1.12-2.5.0-beta4.95
NetherMetals-1.12-1.2.0-beta2.35
EndMetals-1.12-1.2.0-beta2.24

can confirm that this works with the new update, thanks :)