Protocollib version: ProtocolLib v5.2.0-SNAPSHOT-679

My code:

PacketContainer playerInfoPacket = new PacketContainer(PacketType.Play.Server.PLAYER_INFO);
playerInfoPacket.getModifier().write(0, EnumWrappers.PlayerInfoAction.ADD_PLAYER);
playerInfoPacket.getModifier().write(1, player.getUniqueId());
protocolManager.sendServerPacket(player, playerInfoPacket);

Error:

org.bukkit.command.CommandException: Unhandled exception executing command 'test' in plugin Test v1.0
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:155) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at org.bukkit.craftbukkit.v1_20_R3.CraftServer.dispatchCommand(CraftServer.java:987) ~[paper-1.20.4.jar:git-Paper-378]
at org.bukkit.craftbukkit.v1_20_R3.command.BukkitCommandWrapper.run(BukkitCommandWrapper.java:64) ~[paper-1.20.4.jar:git-Paper-378]
at com.mojang.brigadier.context.ContextChain.runExecutable(ContextChain.java:73) ~[brigadier-1.2.9.jar:?]
at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:32) ~[paper-1.20.4.jar:git-Paper-378]
at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:19) ~[paper-1.20.4.jar:git-Paper-378]
at net.minecraft.commands.execution.UnboundEntryAction.lambda$bind$0(UnboundEntryAction.java:8) ~[paper-1.20.4.jar:git-Paper-378]
at net.minecraft.commands.execution.CommandQueueEntry.a(CommandQueueEntry.java:5) ~[paper-1.20.4.jar:git-Paper-378]
at net.minecraft.commands.execution.ExecutionContext.runCommandQueue(ExecutionContext.java:101) ~[paper-1.20.4.jar:git-Paper-378]
at net.minecraft.commands.Commands.executeCommandInContext(Commands.java:435) ~[?:?]
at net.minecraft.commands.Commands.performCommand(Commands.java:336) ~[?:?]
at net.minecraft.commands.Commands.performCommand(Commands.java:323) ~[?:?]
at net.minecraft.server.network.ServerGamePacketListenerImpl.performChatCommand(ServerGamePacketListenerImpl.java:2234) ~[?:?]
at net.minecraft.server.network.ServerGamePacketListenerImpl.lambda$handleChatCommand$16(ServerGamePacketListenerImpl.java:2194) ~[?:?]
at net.minecraft.util.thread.BlockableEventLoop.lambda$submitAsync$0(BlockableEventLoop.java:59) ~[?:?]
at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?]
at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-1.20.4.jar:git-Paper-378]
at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:153) ~[?:?]
at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[?:?]
at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1458) ~[paper-1.20.4.jar:git-Paper-378]
at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:194) ~[paper-1.20.4.jar:git-Paper-378]
at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:126) ~[?:?]
at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1435) ~[paper-1.20.4.jar:git-Paper-378]
at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1358) ~[paper-1.20.4.jar:git-Paper-378]
at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:136) ~[?:?]
at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1336) ~[paper-1.20.4.jar:git-Paper-378]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1220) ~[paper-1.20.4.jar:git-Paper-378]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:321) ~[paper-1.20.4.jar:git-Paper-378]
at java.lang.Thread.run(Thread.java:1623) ~[?:?]
Caused by: java.lang.IllegalStateException: Unable to set value of field private final java.util.EnumSet net.minecraft.network.protocol.game.ClientboundPlayerInfoUpdatePacket.a
at com.comphenix.protocol.reflect.accessors.DefaultFieldAccessor.set(DefaultFieldAccessor.java:44) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.reflect.StructureModifier.writeInternal(StructureModifier.java:358) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.reflect.StructureModifier.write(StructureModifier.java:321) ~[ProtocolLib.jar:?]
at me.wikterno.test.TestCommand.onCommand(TestCommand.java:34) ~[Test-1.0.jar:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
... 29 more
Caused by: java.lang.ClassCastException: Cannot cast com.comphenix.protocol.wrappers.EnumWrappers$PlayerInfoAction to java.util.EnumSet
at java.lang.Class.cast(Class.java:3991) ~[?:?]
at com.comphenix.protocol.reflect.accessors.DefaultFieldAccessor.set(DefaultFieldAccessor.java:41) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.reflect.StructureModifier.writeInternal(StructureModifier.java:358) ~[ProtocolLib.jar:?]
at com.comphenix.protocol.reflect.StructureModifier.write(StructureModifier.java:321) ~[ProtocolLib.jar:?]
at me.wikterno.test.TestCommand.onCommand(TestCommand.java:34) ~[Test-1.0.jar:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
... 29 more

solved... playerInfoPacket.getModifier().write(0, EnumSet.of(EnumWrappers.PlayerInfoAction.ADD_PLAYER));