Minecolonies version

minecolonies-universal-1.10.2-0.8.3056

Expected behavior

Place Supply Camp block

Actual behaviour

No response in game, minecraft logs generate the following error upon each attempt:

[Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.IllegalAccessError: tried to access field net.minecraft.world.gen.structure.template.Template.field_186270_a from class com.minecolonies.structures.helpers.Structure
at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_121]
at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_121]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:668) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613) [MinecraftServer.class:?]
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:149) [bzl.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]
Caused by: java.lang.IllegalAccessError: tried to access field net.minecraft.world.gen.structure.template.Template.field_186270_a from class com.minecolonies.structures.helpers.Structure
at com.minecolonies.structures.helpers.Structure.getBlockInfo(Structure.java:443) ~[Structure.class:?]
at com.minecolonies.structures.helpers.StructureProxy.(StructureProxy.java:51) ~[StructureProxy.class:?]
at com.minecolonies.coremod.util.StructureWrapper.(StructureWrapper.java:67) ~[StructureWrapper.class:?]
at com.minecolonies.coremod.util.StructureWrapper.tryToLoadAndPlaceSupplyCampWithRotation(StructureWrapper.java:126) ~[StructureWrapper.class:?]
at com.minecolonies.coremod.items.ItemSupplyCampDeployer.checkAndPlaceSupplyCamp(ItemSupplyCampDeployer.java:162) ~[ItemSupplyCampDeployer.class:?]
at com.minecolonies.coremod.items.ItemSupplyCampDeployer.spawnCamp(ItemSupplyCampDeployer.java:151) ~[ItemSupplyCampDeployer.class:?]
at com.minecolonies.coremod.items.ItemSupplyCampDeployer.func_180614_a(ItemSupplyCampDeployer.java:108) ~[ItemSupplyCampDeployer.class:?]
at net.minecraftforge.common.ForgeHooks.onPlaceItemIntoWorld(ForgeHooks.java:780) ~[ForgeHooks.class:?]
at net.minecraft.item.ItemStack.func_179546_a(ItemStack.java:145) ~[adz.class:?]
at net.minecraft.server.management.PlayerInteractionManager.func_187251_a(PlayerInteractionManager.java:493) ~[lv.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_184337_a(NetHandlerPlayServer.java:679) ~[me.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:55) ~[jj.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(SourceFile:11) ~[jj.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[fl$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_121]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_121]
at net.minecraft.util.Util.func_181617_a(SourceFile:45) ~[h.class:?]
... 5 more

Steps to reproduce the problem

Loaded game with MultiMC 0.5.0-945,
lwjgl-2.9.1
Forge 12.18.3.2316

Same problem - when you click the green tick, the design goes away and nothing more happens.
Also same for supply ship, even when there's clearly more than enough space for it.

minecolonies-universal-1.12-0.8.3238
forge-1.12-14.21.1.2428-installer-win

What kind of mods did you have installed?
Did you have any coremods installed?
This does seem to be a problem with another mod.
Since our mod relies on on certain minecraft classes.
Can you try it please without any coremods and check if it works?
I will close it for now.
@Zygus42 Please open a new issue for that if still relevant.

@Raycoms No other mods in my case--just Minecraft with LWJGL (2.9.1), Forge (1.10.2-12.18.3.2316), and Minecolonies as stated in the original report.

I figured out my problem with this - because I was testing in creative I gave myself the tool and the supply camp block, and the tool appears to work but doesn't place, but when you actually play in survival, you have to place the supply camp block first and that then gives you the tool in a chest which you then use from then on. That little inconsistency appears to be causing issues for people like me who forget the start :)