[18:47:00] [Server thread/ERROR] [Sponge]: Could not pass InteractItemEvent$Secondary$MainHand$Impl to Plugin{id=gwm_crates, name=GWMCrates, version=1.121, description=Universal crates plugin for your server!, authors=[GWM], source=/opt/msm/servers/rtest/mods/GWMCrates.jar}
java.lang.NoSuchMethodError: org.spongepowered.api.item.inventory.ItemStack.empty()Lorg/spongepowered/api/item/inventory/ItemStack;
        at ua.gwm.sponge_plugin.crates.caze.cases.ItemCase.add(ItemCase.java:58) ~[ItemCase.class:?]
        at ua.gwm.sponge_plugin.crates.listener.ItemCaseListener.openItemCase(ItemCaseListener.java:46) ~[ItemCaseListener.class:?]
        at org.spongepowered.common.event.listener.MainHandListener_ItemCaseListener_openItemCase36.handle(Unknown Source) ~[?:?]
        at org.spongepowered.common.event.RegisteredListener.handle(RegisteredListener.java:95) ~[RegisteredListener.class:1.10.2-2281-5.2.0-BETA-2371]
        at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:319) [SpongeModEventManager.class:1.10.2-2281-5.2.0-BETA-2371]
        at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:350) [SpongeModEventManager.class:1.10.2-2281-5.2.0-BETA-2371]
        at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:334) [SpongeModEventManager.class:1.10.2-2281-5.2.0-BETA-2371]
        at org.spongepowered.common.SpongeImpl.postEvent(SpongeImpl.java:143) [SpongeImpl.class:1.10.2-2281-5.2.0-BETA-2371]
        at org.spongepowered.common.event.SpongeCommonEventFactory.callInteractItemEventSecondary(SpongeCommonEventFactory.java:435) [SpongeCommonEventFactory.class:1.10.2-2281-5.2.0-BETA-2371]
        at org.spongepowered.common.network.PacketUtil.firePreEvents(PacketUtil.java:253) [PacketUtil.class:1.10.2-2281-5.2.0-BETA-2371]
        at org.spongepowered.common.network.PacketUtil.onProcessPacket(PacketUtil.java:90) [PacketUtil.class:1.10.2-2281-5.2.0-BETA-2371]
        at net.minecraft.network.PacketThreadUtil$1.redirect$onProcessPacket$zjh000(SourceFile:539) [fl$1.class:?]
        at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [fl$1.class:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_72]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_72]
        at net.minecraft.util.Util.func_181617_a(SourceFile:45) [h.class:?]
        at org.spongepowered.common.SpongeImplHooks.onUtilRunTask(SpongeImplHooks.java:241) [SpongeImplHooks.class:1.10.2-2281-5.2.0-BETA-2371]
        at net.minecraft.server.MinecraftServer.redirect$onRun$zhn000(MinecraftServer.java:3928) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:668) [MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387) [ld.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471) [MinecraftServer.class:?]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_72]