[22:15:40] [Server thread/WARN]: [CraftBook] Failed to load mechanic: Chairs
java.lang.NoClassDefFoundError: com/comphenix/protocol/events/PacketListener
	at java.lang.Class.getDeclaredConstructors0(Native Method) ~[?:1.8.0_202]
	at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671) ~[?:1.8.0_202]
	at java.lang.Class.getConstructor0(Class.java:3075) ~[?:1.8.0_202]
	at java.lang.Class.newInstance(Class.java:412) ~[?:1.8.0_202]
	at com.sk89q.craftbook.bukkit.CraftBookPlugin.setupCraftBook(CraftBookPlugin.java:564) ~[?:?]
	at com.sk89q.craftbook.bukkit.CraftBookPlugin.onEnable(CraftBookPlugin.java:452) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[patched_1.15.1.jar:git-Paper-60]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:338) ~[patched_1.15.1.jar:git-Paper-60]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:420) ~[patched_1.15.1.jar:git-Paper-60]
	at org.bukkit.craftbukkit.v1_15_R1.CraftServer.enablePlugin(CraftServer.java:468) ~[patched_1.15.1.jar:git-Paper-60]
	at org.bukkit.craftbukkit.v1_15_R1.CraftServer.enablePlugins(CraftServer.java:382) ~[patched_1.15.1.jar:git-Paper-60]
	at net.minecraft.server.v1_15_R1.MinecraftServer.a(MinecraftServer.java:481) ~[patched_1.15.1.jar:git-Paper-60]
	at net.minecraft.server.v1_15_R1.DedicatedServer.init(DedicatedServer.java:290) ~[patched_1.15.1.jar:git-Paper-60]
	at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:884) ~[patched_1.15.1.jar:git-Paper-60]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_202]
Caused by: java.lang.ClassNotFoundException: com.comphenix.protocol.events.PacketListener
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[?:1.8.0_202]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:139) ~[patched_1.15.1.jar:git-Paper-60]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:85) ~[patched_1.15.1.jar:git-Paper-60]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_202]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_202]
	... 15 more