服务端为CatServer最新的稳定版
错误内容：
[23:18:47] [Server thread/FATAL]: Error executing task java.util.concurrent.ExecutionException: java.lang.ClassCastException: net.minecraft.item.ItemAir cannot be cast to com.meteor.extrabotany.common.item.lens.ItemLens at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_211] at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_211] at net.minecraft.util.Util.func_181617_a(Util.java:51) [h.class:?] at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:841) [MinecraftServer.class:?] at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:472) [nz.class:?] at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:778) [MinecraftServer.class:?] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:632) [MinecraftServer.class:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_211] Caused by: java.lang.ClassCastException: net.minecraft.item.ItemAir cannot be cast to com.meteor.extrabotany.common.item.lens.ItemLens at com.meteor.extrabotany.common.crafting.recipe.brew.PotionLensRecipe.func_77572_b(PotionLensRecipe.java:62) ~[PotionLensRecipe.class:?] at net.minecraft.inventory.Container.func_192389_a(Container.java:949) ~[afr.class:?] at net.minecraft.inventory.ContainerPlayer.func_75130_a(ContainerPlayer.java:99) ~[agi.class:?] at net.minecraft.inventory.InventoryCrafting.func_70299_a(InventoryCrafting.java:146) ~[afy.class:?] at net.minecraft.inventory.Slot.func_75215_d(Slot.java:70) ~[agr.class:?] at net.minecraft.inventory.Container.func_184996_a(Container.java:423) ~[afr.class:?] at net.minecraft.network.NetHandlerPlayServer.func_147351_a(NetHandlerPlayServer.java:2121) ~[pa.class:?] at net.minecraft.network.play.client.CPacketClickWindow.func_148833_a(CPacketClickWindow.java:38) ~[lf.class:?] at net.minecraft.network.play.client.CPacketClickWindow.func_148833_a(CPacketClickWindow.java:12) ~[lf.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_211] at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_211] at net.minecraft.util.Util.func_181617_a(Util.java:50) ~[h.class:?]

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