17:10:28] [Server thread/ERROR] [Sponge]: Could not pass MultiPlaceEvent to SpongePlugin:DropParty{0.1}
ava.lang.AbstractMethodError: net.minecraft.item.ItemStack.getProperties()Ljava/util/Collection;
       at org.spongepowered.api.item.inventory.ItemStackComparators$Properties.compare(ItemStackComparators.java:130) ~[
       at org.spongepowered.api.item.inventory.ItemStackComparators$Properties.compare(ItemStackComparators.java:117) ~[
       at com.google.common.collect.CompoundOrdering.compare(CompoundOrdering.java:43) ~[minecraft_server.1.8.jar:?]
       at io.github.hsyyid.dropparty.Main.onPlayerPlaceBlock(Main.java:231) ~[Main.class:1.0]
       at org.spongepowered.common.event.handler.PlayerPlaceBlockEventHandler_Main_onPlayerPlaceBlock4.handle(Unknown So
       at org.spongepowered.common.event.RegisteredHandler.handle(RegisteredHandler.java:86) ~[RegisteredHandler.class:1
       at org.spongepowered.common.event.SpongeEventManager.post(SpongeEventManager.java:248) [SpongeEventManager.class:
       at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:181) [SpongeModEventManager.
       at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:57) [EventBus.class:?]
       at net.minecraftforge.event.ForgeEventFactory.onPlayerMultiBlockPlace(ForgeEventFactory.java:88) [ForgeEventFacto
       at net.minecraftforge.common.ForgeHooks.onPlaceItemIntoWorld(ForgeHooks.java:594) [ForgeHooks.class:?]
       at net.minecraft.item.ItemStack.func_179546_a(ItemStack.java:132) [amj.class:?]
       at net.minecraft.server.management.ItemInWorldManager.func_180236_a(ItemInWorldManager.java:446) [qx.class:?]
       at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:595) [rj.class:?]
       at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_180769_a(SourceFile:59) [mx.class:?]
       at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:10) [mx.class:?]
       at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [ih.class:?]
       at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_51]
       at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_51]
       at net.minecraftforge.fml.common.FMLCommonHandler.callFuture(FMLCommonHandler.java:714) [FMLCommonHandler.class:?
       at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:656) [MinecraftServer.class:?]
       at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:364) [po.class:?]
       at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:598) [MinecraftServer.class:?]
       at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:478) [MinecraftServer.class:?]
       at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51]