[19:07:34] [Server thread/FATAL] [minecraft/MinecraftServer]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NoClassDefFoundError: vazkii/patchouli/client/book/gui/GuiBook
        at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_221]
        at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_221]
        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_221]
Caused by: java.lang.NoClassDefFoundError: vazkii/patchouli/client/book/gui/GuiBook
        at com.codetaylor.mc.pyrotech.modules.core.item.ItemBook.func_77659_a(ItemBook.java:63) ~[ItemBook.class:?]
        at net.minecraft.item.ItemStack.func_77957_a(ItemStack.java:217) ~[aip.class:?]
        at net.minecraft.server.management.PlayerInteractionManager.func_187250_a(PlayerInteractionManager.java:358) ~[or.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:765) ~[pa.class:?]
        at net.minecraft.network.play.client.CPacketPlayerTryUseItem.func_148833_a(SourceFile:32) ~[mb.class:?]
        at net.minecraft.network.play.client.CPacketPlayerTryUseItem.func_148833_a(SourceFile:9) ~[mb.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_221]
        at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_221]
        at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
        ... 5 more
Caused by: java.lang.ClassNotFoundException: vazkii.patchouli.client.book.gui.GuiBook
        at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101) ~[launchwrapper-1.12.jar:?]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_221]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_221]
        at com.codetaylor.mc.pyrotech.modules.core.item.ItemBook.func_77659_a(ItemBook.java:63) ~[ItemBook.class:?]
        at net.minecraft.item.ItemStack.func_77957_a(ItemStack.java:217) ~[aip.class:?]
        at net.minecraft.server.management.PlayerInteractionManager.func_187250_a(PlayerInteractionManager.java:358) ~[or.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:765) ~[pa.class:?]
        at net.minecraft.network.play.client.CPacketPlayerTryUseItem.func_148833_a(SourceFile:32) ~[mb.class:?]
        at net.minecraft.network.play.client.CPacketPlayerTryUseItem.func_148833_a(SourceFile:9) ~[mb.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_221]
        at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_221]
        at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
        ... 5 more