Protocol error

If you get an error about Protocol please install latest ProtocolLib https://www.spigotmc.org/resources/protocollib.1997/

Error occurred while enabling ItemsAdder v1.1.16 (Is it up to date?)
java.lang.NoClassDefFoundError: com/comphenix/protocol/events/PacketListener
	at dev.lone.itemsadder.c.c.l.<init>(Unknown Source) ~[?:?]
	at dev.lone.itemsadder.c.d.l.j(Unknown Source) ~[?:?]
	at dev.lone.itemsadder.c.d.l.<init>(Unknown Source) ~[?:?]
	at dev.lone.itemsadder.c.a.reload(Unknown Source) ~[?:?]
	at dev.lone.itemsadder.c.a.<init>(Unknown Source) ~[?:?]
	at dev.lone.itemsadder.Main.t(Unknown Source) ~[?:?]
	at dev.lone.itemsadder.Main.onEnable(Unknown Source) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[patched_1.14.4.jar:git-Paper-186]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:338) ~[patched_1.14.4.jar:git-Paper-186]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:420) ~[patched_1.14.4.jar:git-Paper-186]
	at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugin(CraftServer.java:467) ~[patched_1.14.4.jar:git-Paper-186]
	at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugins(CraftServer.java:381) ~[patched_1.14.4.jar:git-Paper-186]
	at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:474) ~[patched_1.14.4.jar:git-Paper-186]
	at net.minecraft.server.v1_14_R1.DedicatedServer.init(DedicatedServer.java:290) ~[patched_1.14.4.jar:git-Paper-186]
	at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:870) ~[patched_1.14.4.jar:git-Paper-186]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]
Caused by: java.lang.ClassNotFoundException: com.comphenix.protocol.events.PacketListener
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[?:1.8.0_212]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:139) ~[patched_1.14.4.jar:git-Paper-186]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:85) ~[patched_1.14.4.jar:git-Paper-186]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_212]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_212]
	... 16 more