Issue causing kicks on tabbing commands

[agoniaprivat]

Internal Exception: java.lang.NoClassDefFoundError: Could not initialize class net.kyori.adventure.platform.bukkit.BukkitComponentSerializer

gets thrown in console and player gets kicked while tabbing inside of a command.

Been testing without other plugins and troubleshooting with binary search and i'm sure this issue comes from InteractiveChat.
Also, saw others reporting this on the discord - but didn't see any Github issuereport about it.

Of what I can tell, it only happens on tabbing non-vanilla commands.

[LOOHP]

Can you post the whole stacktrace?

[Tizooo]

same issue here

[10:41:33] [Render thread/WARN]: Client disconnected with reason: You were kicked from Survival: Internal Exception: java.lang.NoClassDefFoundError: Could not initialize class net.kyori.adventure.platform.bukkit.BukkitComponentSerializer

nothing more shows in the logs. im on 21.2 paper

[LOOHP]

Is that an error on the client? Are there errors on the server?

[Tizooo]

in the client logs, nothing on the server

[Tizooo]

btw your discord server link is not working anymore

[LOOHP]

Is it on the vanilla client? Or are you using a modded client?

Thanks for notifying me about the discord link issue.

[Tizooo]

tried it on a localhost using 26.2 paper and vanilla 26.2 client, if i use /tpa and the tabcompletion should start i get kicked, on the client i get this error:
Client disconnected with reason: Internal Exception: java.lang.NoSuchMethodError: 'net.kyori.adventure.util.Buildable$Builder net.kyori.adventure.text.flattener.ComponentFlattener.toBuilder()'

and in the server logs it says:
Tizooo lost connection: Internal Exception: java.lang.NoClassDefFoundError: Could not initialize class net.kyori.adventure.platform.bukkit.BukkitComponentSerializer

[LOOHP]

Have you tried without IC PacketEvents?

[Tizooo]

then i get this console error

[11:15:21 INFO]: [packetevents] Enabling packetevents v2.13.0
[11:15:21 INFO]: [packetevents] Checking for updates, please wait...
[11:15:21 INFO]: [InteractiveChat] Enabling InteractiveChat v2026.1.1.0
[11:15:21 INFO]: [packetevents] You are running the latest release: 2.13.0
[11:15:27 ERROR]: Error occurred while enabling InteractiveChat v2026.1.1.0 (Is it up to date?)
java.lang.IllegalStateException: Attempted to initialise InteractiveChat when no protocol provider was found. Please install ProtocolLib, or the PacketEvents addon at https://github.com/TerraByteDev/InteractiveChat-PacketEvents
at InteractiveChat-2026.1.1.0.jar//com.loohp.interactivechat.InteractiveChat.onEnable(InteractiveChat.java:464) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:279) ~[paper-api-26.2.build.62-beta.jar:?]
at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:201) ~[paper-26.2.jar:26.2-62-75c0b48]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-26.2.jar:26.2-62-75c0b48]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:519) ~[paper-api-26.2.build.62-beta.jar:?]
at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:633) ~[paper-26.2.jar:26.2-62-75c0b48]
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:590) ~[paper-26.2.jar:26.2-62-75c0b48]
at net.minecraft.server.MinecraftServer.initPostWorld(MinecraftServer.java:648) ~[paper-26.2.jar:26.2-62-75c0b48]
at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:343) ~[paper-26.2.jar:26.2-62-75c0b48]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1267) ~[paper-26.2.jar:26.2-62-75c0b48]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:303) ~[paper-26.2.jar:26.2-62-75c0b48]
at java.base/java.lang.Thread.run(Thread.java:1474) ~[?:?]
[11:15:27 INFO]: [InteractiveChat] Disabling InteractiveChat v2026.1.1.0
[11:15:27 ERROR]: Error occurred while disabling InteractiveChat v2026.1.1.0
java.lang.ExceptionInInitializerError
at InteractiveChat-2026.1.1.0.jar//com.loohp.interactivechat.InteractiveChat.onDisable(InteractiveChat.java:737) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:285) ~[paper-api-26.2.build.62-beta.jar:?]
at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.disablePlugin(PaperPluginInstanceManager.java:236) ~[paper-26.2.jar:26.2-62-75c0b48]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.disablePlugin(PaperPluginManagerImpl.java:114) ~[paper-26.2.jar:26.2-62-75c0b48]
at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:549) ~[paper-api-26.2.build.62-beta.jar:?]
at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:205) ~[paper-26.2.jar:26.2-62-75c0b48]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-26.2.jar:26.2-62-75c0b48]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:519) ~[paper-api-26.2.build.62-beta.jar:?]
at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:633) ~[paper-26.2.jar:26.2-62-75c0b48]
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:590) ~[paper-26.2.jar:26.2-62-75c0b48]
at net.minecraft.server.MinecraftServer.initPostWorld(MinecraftServer.java:648) ~[paper-26.2.jar:26.2-62-75c0b48]
at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:343) ~[paper-26.2.jar:26.2-62-75c0b48]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1267) ~[paper-26.2.jar:26.2-62-75c0b48]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:303) ~[paper-26.2.jar:26.2-62-75c0b48]
at java.base/java.lang.Thread.run(Thread.java:1474) ~[?:?]
Caused by: org.bukkit.plugin.IllegalPluginAccessException: Plugin attempted to register task while disabled
at org.bukkit.craftbukkit.scheduler.CraftScheduler.validate(CraftScheduler.java:532) ~[paper-26.2.jar:26.2-62-75c0b48]
at org.bukkit.craftbukkit.scheduler.CraftScheduler.runTaskTimer(CraftScheduler.java:218) ~[paper-26.2.jar:26.2-62-75c0b48]
at org.bukkit.craftbukkit.scheduler.CraftScheduler.runTaskTimer(CraftScheduler.java:209) ~[paper-26.2.jar:26.2-62-75c0b48]
at InteractiveChat-2026.1.1.0.jar//com.loohp.interactivechat.libs.com.loohp.platformscheduler.platform.bukkit.BukkitScheduler.runTaskTimer(BukkitScheduler.java:202) ~[?:?]
at InteractiveChat-2026.1.1.0.jar//com.loohp.interactivechat.libs.com.loohp.platformscheduler.platform.bukkit.BukkitScheduler.runTaskTimer(BukkitScheduler.java:34) ~[?:?]
at InteractiveChat-2026.1.1.0.jar//com.loohp.interactivechat.libs.com.loohp.platformscheduler.Scheduler.runTaskTimer(Scheduler.java:202) ~[?:?]
at InteractiveChat-2026.1.1.0.jar//com.loohp.interactivechat.objectholders.AsyncChatSendingExecutor.packetSender(AsyncChatSendingExecutor.java:269) ~[?:?]
at InteractiveChat-2026.1.1.0.jar//com.loohp.interactivechat.objectholders.AsyncChatSendingExecutor.(AsyncChatSendingExecutor.java:89) ~[?:?]
at InteractiveChat-2026.1.1.0.jar//com.loohp.interactivechat.listeners.packet.MessagePacketHandler.(MessagePacketHandler.java:41) ~[?:?]
... 15 more

[LOOHP]

Try with ProtocolLib.

[LOOHP]

Probably problem with the IC PacketEvents addon. Should be fixed in the new update.