Describe the bug

[22:41:13 WARN]: [com.github.kaspiandev.antipopup.libs.packetevents.PacketEventsAPI] No data was sent for dimension Compound{{name=String(minecraft:overworld), id=Int(0)}} to ZARAEM
[22:41:13 ERROR]: Could not pass event PlayerJoinEvent to AntiPopup v8.1
java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/v1_20_R4/entity/CraftPlayer
at AntiPopup-8.1.jar/com.github.kaspiandev.antipopup.nms.v1_20_6.PlayerInjector_v1_20_6.inject(PlayerInjector_v1_20_6.java:57) ~[AntiPopup-8.1.jar:?]
at AntiPopup-8.1.jar/com.github.kaspiandev.antipopup.spigot.nms.PlayerListener.onJoin(PlayerListener.java:19) ~[AntiPopup-8.1.jar:?]
at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor113.execute(Unknown Source) ~[?:?]
at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:77) ~[paper-api-1.21-R0.1-SNAPSHOT.jar:?]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:81) ~[paper-api-1.21-R0.1-SNAPSHOT.jar:1.21-2-b4b8208]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[paper-api-1.21-R0.1-SNAPSHOT.jar:?]
at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54) ~[paper-1.21.jar:1.21-2-b4b8208]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:131) ~[paper-1.21.jar:1.21-2-b4b8208]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:628) ~[paper-api-1.21-R0.1-SNAPSHOT.jar:?]
at net.minecraft.server.players.PlayerList.placeNewPlayer(PlayerList.java:347) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.server.network.ServerConfigurationPacketListenerImpl.handleConfigurationFinished(ServerConfigurationPacketListenerImpl.java:173) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.network.protocol.configuration.ServerboundFinishConfigurationPacket.handle(ServerboundFinishConfigurationPacket.java:22) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.network.protocol.configuration.ServerboundFinishConfigurationPacket.handle(ServerboundFinishConfigurationPacket.java:13) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$0(PacketUtils.java:36) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:151) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1478) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:201) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:125) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1456) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1449) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:135) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.server.MinecraftServer.managedBlock(MinecraftServer.java:1408) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1415) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1260) ~[paper-1.21.jar:1.21-2-b4b8208]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:329) ~[paper-1.21.jar:1.21-2-b4b8208]
at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.ClassNotFoundException: org.bukkit.craftbukkit.v1_20_R4.entity.CraftPlayer
... 28 more

Everytime a player joins, this error is printed to console.

To Reproduce

Start server

Expected behavior

No response

Operating System

Debian 12

Server Software

PaperMC 1.21 Experimental

Server Version

Not Listed

Proxy Type

None

Plugin List

AntiPopup, DiscordIntegration, *DynamicSlots, Essentials, EssentialsChat, EssentialsDiscord, EssentialsGeoIP, GSit, InteractiveChat, LuckPerms, Ping-Wheel-Plugin, Pl3xMap, PlaceholderAPI, PlasmoVoice, ProtocolLib, RHLeafDecay, ServerBackup, spark, TAB

Server logs

https://mclo.gs/4O2SCGG

AntiPopup doesn't support 1.21 yet #92