Hey i am using pufferfish 1.20.4 server version and i only have Protocolib, lonelibs and itemadder installed on my server but still i am having this issue for some reason on startup and i am using latest version of all plugins.
Here Are my logs:-
[07:28:42 ERROR]: Error occurred while enabling ItemsAdder v3.6.3-beta-14 (Is it up to date?)
java.lang.NullPointerException: Cannot invoke "com.comphenix.protocol.ProtocolManager.getMinecraftVersion()" because the return value of "com.comphenix.protocol.ProtocolLibrary.getProtocolManager()" is null
at ia.m.iW.P(SourceFile:697) \~[ItemsAdder_3.6.3-beta-14 (1).jar:?]
at ia.m.iZ.b(SourceFile:199) \~[ItemsAdder_3.6.3-beta-14 (1).jar:?]
at dev.lone.itemsadder.Main.onEnable(SourceFile:216) \~[ItemsAdder_3.6.3-beta-14 (1).jar:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:287) \~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:188) \~[paper-1.20.4.jar:git-Paper-496]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:104) \~[paper-1.20.4.jar:git-Paper-496]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:507) \~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at org.bukkit.craftbukkit.v1_20_R3.CraftServer.enablePlugin(CraftServer.java:639) \~[paper-1.20.4.jar:git-Paper-496]
at org.bukkit.craftbukkit.v1_20_R3.CraftServer.enablePlugins(CraftServer.java:550) \~[paper-1.20.4.jar:git-Paper-496]
at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:671) \~[paper-1.20.4.jar:git-Paper-496]
at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:431) \~[paper-1.20.4.jar:git-Paper-496]
at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:309) \~[paper-1.20.4.jar:git-Paper-496]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1131) \~[paper-1.20.4.jar:git-Paper-496]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:319) \~[paper-1.20.4.jar:git-Paper-496]
at java.lang.Thread.run(Thread.java:840) \~[?:?]
[07:28:42 INFO]: [ItemsAdder] Disabling ItemsAdder v3.6.3-beta-14
[07:28:42 ERROR]: Error occurred while disabling ItemsAdder v3.6.3-beta-14
java.lang.NullPointerException: Cannot invoke "com.comphenix.protocol.ProtocolManager.removePacketListeners(org.bukkit.plugin.Plugin)" because the return value of "com.comphenix.protocol.ProtocolLibrary.getProtocolManager()" is null
at dev.lone.itemsadder.Main.onDisable(SourceFile:678) \~[ItemsAdder_3.6.3-beta-14 (1).jar:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:290) \~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.disablePlugin(PaperPluginInstanceManager.java:223) \~[paper-1.20.4.jar:git-Paper-496]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.disablePlugin(PaperPluginManagerImpl.java:109) \~[paper-1.20.4.jar:git-Paper-496]
at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:537) \~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:192) \~[paper-1.20.4.jar:git-Paper-496]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:104) \~[paper-1.20.4.jar:git-Paper-496]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:507) \~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at org.bukkit.craftbukkit.v1_20_R3.CraftServer.enablePlugin(CraftServer.java:639) \~[paper-1.20.4.jar:git-Paper-496]
at org.bukkit.craftbukkit.v1_20_R3.CraftServer.enablePlugins(CraftServer.java:550) \~[paper-1.20.4.jar:git-Paper-496]
at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:671) \~[paper-1.20.4.jar:git-Paper-496]
at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:431) \~[paper-1.20.4.jar:git-Paper-496]
at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:309) \~[paper-1.20.4.jar:git-Paper-496]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1131) \~[paper-1.20.4.jar:git-Paper-496]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:319) \~[paper-1.20.4.jar:git-Paper-496]
at java.lang.Thread.run(Thread.java:840) \~[?:?]
