The flywheel multiblock doesn't form on servers: after right clicking the heavy engineering blocks, the multiblock seems to form, but right clicking any of the multiblock's parts causes it to bug out. The server console also throws a series of errors:
[23:31:00] [Server thread/FATAL] [minecraft/MinecraftServer]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NoClassDefFoundError: net/minecraft/client/Minecraft
at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_321]
at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_321]
at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:723) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397) [nz.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_321]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/Minecraft
at malte0811.industrialwires.mech_mb.Material.(Material.java:90) ~[Material.class:?]
at malte0811.industrialwires.mech_mb.Material.(Material.java:38) ~[Material.class:?]
at malte0811.industrialwires.mech_mb.MechPartFlywheel.canForm(MechPartFlywheel.java:120) ~[MechPartFlywheel.class:?]
at malte0811.industrialwires.mech_mb.MultiblockMechMB.createStructure(MultiblockMechMB.java:118) ~[MultiblockMechMB.class:?]
at blusunrize.immersiveengineering.common.items.ItemIETool.onItemUseFirst(ItemIETool.java:289) ~[ItemIETool.class:?]
at net.minecraft.item.ItemStack.onItemUseFirst(ItemStack.java:200) ~[aip.class:?]
at net.minecraft.server.management.PlayerInteractionManager.func_187251_a(PlayerInteractionManager.java:439) ~[or.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_184337_a(NetHandlerPlayServer.java:741) ~[pa.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:55) ~[ma.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:11) ~[ma.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[hv$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_321]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_321]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
... 5 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.Minecraft
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_321]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_321]
at malte0811.industrialwires.mech_mb.Material.(Material.java:90) ~[Material.class:?]
at malte0811.industrialwires.mech_mb.Material.(Material.java:38) ~[Material.class:?]
at malte0811.industrialwires.mech_mb.MechPartFlywheel.canForm(MechPartFlywheel.java:120) ~[MechPartFlywheel.class:?]
at malte0811.industrialwires.mech_mb.MultiblockMechMB.createStructure(MultiblockMechMB.java:118) ~[MultiblockMechMB.class:?]
at blusunrize.immersiveengineering.common.items.ItemIETool.onItemUseFirst(ItemIETool.java:289) ~[ItemIETool.class:?]
at net.minecraft.item.ItemStack.onItemUseFirst(ItemStack.java:200) ~[aip.class:?]
at net.minecraft.server.management.PlayerInteractionManager.func_187251_a(PlayerInteractionManager.java:439) ~[or.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_184337_a(NetHandlerPlayServer.java:741) ~[pa.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:55) ~[ma.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:11) ~[ma.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[hv$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_321]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_321]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
... 5 more
Caused by: net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerException: Exception in class transformer net.minecraftforge.fml.common.asm.transformers.SideTransformer@c68a5f8 from coremod FMLCorePlugin
at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:260) ~[forge-1.12.2-14.23.5.2860.jar:?]
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279) ~[launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_321]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_321]
at malte0811.industrialwires.mech_mb.Material.(Material.java:90) ~[Material.class:?]
at malte0811.industrialwires.mech_mb.Material.(Material.java:38) ~[Material.class:?]
at malte0811.industrialwires.mech_mb.MechPartFlywheel.canForm(MechPartFlywheel.java:120) ~[MechPartFlywheel.class:?]
at malte0811.industrialwires.mech_mb.MultiblockMechMB.createStructure(MultiblockMechMB.java:118) ~[MultiblockMechMB.class:?]
at blusunrize.immersiveengineering.common.items.ItemIETool.onItemUseFirst(ItemIETool.java:289) ~[ItemIETool.class:?]
at net.minecraft.item.ItemStack.onItemUseFirst(ItemStack.java:200) ~[aip.class:?]
at net.minecraft.server.management.PlayerInteractionManager.func_187251_a(PlayerInteractionManager.java:439) ~[or.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_184337_a(NetHandlerPlayServer.java:741) ~[pa.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:55) ~[ma.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:11) ~[ma.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[hv$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_321]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_321]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
... 5 more
Caused by: java.lang.RuntimeException: Attempted to load class bib for invalid side SERVER
at net.minecraftforge.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:62) ~[forge-1.12.2-14.23.5.2860.jar:?]
at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:256) ~[forge-1.12.2-14.23.5.2860.jar:?]
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279) ~[launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_321]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_321]
at malte0811.industrialwires.mech_mb.Material.(Material.java:90) ~[Material.class:?]
at malte0811.industrialwires.mech_mb.Material.(Material.java:38) ~[Material.class:?]
at malte0811.industrialwires.mech_mb.MechPartFlywheel.canForm(MechPartFlywheel.java:120) ~[MechPartFlywheel.class:?]
at malte0811.industrialwires.mech_mb.MultiblockMechMB.createStructure(MultiblockMechMB.java:118) ~[MultiblockMechMB.class:?]
at blusunrize.immersiveengineering.common.items.ItemIETool.onItemUseFirst(ItemIETool.java:289) ~[ItemIETool.class:?]
at net.minecraft.item.ItemStack.onItemUseFirst(ItemStack.java:200) ~[aip.class:?]
at net.minecraft.server.management.PlayerInteractionManager.func_187251_a(PlayerInteractionManager.java:439) ~[or.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_184337_a(NetHandlerPlayServer.java:741) ~[pa.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:55) ~[ma.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:11) ~[ma.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[hv$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_321]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_321]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
... 5 more
[23:31:00] [Server thread/FATAL] [minecraft/MinecraftServer]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NoClassDefFoundError: Could not initialize class malte0811.industrialwires.mech_mb.Material
at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_321]
at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_321]
at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:723) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397) [nz.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_321]
Caused by: java.lang.NoClassDefFoundError: Could not initialize class malte0811.industrialwires.mech_mb.Material
at malte0811.industrialwires.mech_mb.MechPartFlywheel.canForm(MechPartFlywheel.java:120) ~[MechPartFlywheel.class:?]
at malte0811.industrialwires.mech_mb.MultiblockMechMB.createStructure(MultiblockMechMB.java:118) ~[MultiblockMechMB.class:?]
at blusunrize.immersiveengineering.common.items.ItemIETool.onItemUseFirst(ItemIETool.java:289) ~[ItemIETool.class:?]
at net.minecraft.item.ItemStack.onItemUseFirst(ItemStack.java:200) ~[aip.class:?]
at net.minecraft.server.management.PlayerInteractionManager.func_187251_a(PlayerInteractionManager.java:439) ~[or.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_184337_a(NetHandlerPlayServer.java:741) ~[pa.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:55) ~[ma.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:11) ~[ma.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[hv$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_321]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_321]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
... 5 more
[23:31:01] [Server thread/FATAL] [minecraft/MinecraftServer]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NoClassDefFoundError: Could not initialize class malte0811.industrialwires.mech_mb.Material
at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_321]
at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_321]
at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:723) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397) [nz.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_321]
Caused by: java.lang.NoClassDefFoundError: Could not initialize class malte0811.industrialwires.mech_mb.Material
at malte0811.industrialwires.mech_mb.MechPartFlywheel.canForm(MechPartFlywheel.java:120) ~[MechPartFlywheel.class:?]
at malte0811.industrialwires.mech_mb.MultiblockMechMB.createStructure(MultiblockMechMB.java:118) ~[MultiblockMechMB.class:?]
at blusunrize.immersiveengineering.common.items.ItemIETool.onItemUseFirst(ItemIETool.java:289) ~[ItemIETool.class:?]
at net.minecraft.item.ItemStack.onItemUseFirst(ItemStack.java:200) ~[aip.class:?]
at net.minecraft.server.management.PlayerInteractionManager.func_187251_a(PlayerInteractionManager.java:439) ~[or.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_184337_a(NetHandlerPlayServer.java:741) ~[pa.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:55) ~[ma.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:11) ~[ma.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[hv$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_321]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_321]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
... 5 more
[23:31:04] [Server thread/FATAL] [minecraft/MinecraftServer]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NoClassDefFoundError: Could not initialize class malte0811.industrialwires.mech_mb.Material
at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_321]
at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_321]
at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:723) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397) [nz.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_321]
Caused by: java.lang.NoClassDefFoundError: Could not initialize class malte0811.industrialwires.mech_mb.Material
at malte0811.industrialwires.mech_mb.MechPartFlywheel.canForm(MechPartFlywheel.java:120) ~[MechPartFlywheel.class:?]
at malte0811.industrialwires.mech_mb.MultiblockMechMB.createStructure(MultiblockMechMB.java:118) ~[MultiblockMechMB.class:?]
at blusunrize.immersiveengineering.common.items.ItemIETool.onItemUseFirst(ItemIETool.java:289) ~[ItemIETool.class:?]
at net.minecraft.item.ItemStack.onItemUseFirst(ItemStack.java:200) ~[aip.class:?]
at net.minecraft.server.management.PlayerInteractionManager.func_187251_a(PlayerInteractionManager.java:439) ~[or.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_184337_a(NetHandlerPlayServer.java:741) ~[pa.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:55) ~[ma.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:11) ~[ma.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[hv$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_321]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_321]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
... 5 more