How to change displayname of a entity to see for a specified player?

[Kaganox]

I wanted to do that everything see another Displayname by a specified Entity!
So i tried write a method which can set a displayname only for a specified player

public static void SetDisplayname(Player payer, Entity entity, String name){
  PacketContainer packet = ProtocolLibrary.getProtocolManager().createPacket(PacketType.Play.Server.ENTITY_METADATA);
  packet.getIntegers().write(0, entity.getEntityId()); //Set packet's entity id
  WrappedDataWatcher watcher = new WrappedDataWatcher();
  WrappedDataWatcher.Serializer serializer = WrappedDataWatcher.Registry.get(Byte.class);
  watcher.setEntity(player); //Set the new data watcher's target
  watcher.setObject(0, serializer, (byte) (0x40)); //Set status to glowing, found on protocol page
  Optional<?> opt = Optional.of(WrappedChatComponent.fromChatMessage(name)[0]);
  
  watcher.setObject(new WrappedDataWatcher.WrappedDataWatcherObject(2, WrappedDataWatcher.Registry.getChatComponentSerializer(true)), opt);
  
  packet.getWatchableCollectionModifier().write(0, watcher.getWatchableObjects()); //Make the packet's datawatcher the one we created
  
  ProtocolLibrary.getProtocolManager().sendServerPacket(player, packet);
}

But if the player received the packet, he disconnects. And the server prints out this error.

[21:24:13 ERROR]: Error sending packet clientbound/minecraft:set_entity_data
io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:set_entity_data'
	at net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:55) ~[paper-1.21.4.jar:1.21.4-78-49d15f6]
	at net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:13) ~[paper-1.21.4.jar:1.21.4-78-49d15f6]
	at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:27) ~[paper-1.21.4.jar:1.21.4-78-49d15f6]
	at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:12) ~[paper-1.21.4.jar:1.21.4-78-49d15f6]
	at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:107) ~[netty-codec-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:113) ~[netty-codec-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:120) ~[netty-codec-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.ChannelOutboundHandlerAdapter.write(ChannelOutboundHandlerAdapter.java:113) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at net.minecraft.network.Connection$2.write(Connection.java:728) ~[paper-1.21.4.jar:1.21.4-78-49d15f6]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:956) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:982) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:950) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:969) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:310) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at ProtocolLib.jar/com.comphenix.protocol.injector.netty.channel.NettyChannelProxy.writeAndFlush(NettyChannelProxy.java:227) ~[ProtocolLib.jar:?]
	at ProtocolLib.jar/com.comphenix.protocol.injector.netty.channel.NettyChannelProxy.writeAndFlush(NettyChannelProxy.java:233) ~[ProtocolLib.jar:?]
	at net.minecraft.network.Connection.doSendPacket(Connection.java:492) ~[paper-1.21.4.jar:1.21.4-78-49d15f6]
	at net.minecraft.network.Connection.lambda$sendPacket$13(Connection.java:479) ~[paper-1.21.4.jar:1.21.4-78-49d15f6]
	at ProtocolLib.jar/com.comphenix.protocol.injector.netty.channel.NettyEventLoopProxy.lambda$proxyRunnable$2(NettyEventLoopProxy.java:49) ~[ProtocolLib.jar:?]
	at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173) ~[netty-common-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166) ~[netty-common-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472) ~[netty-common-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:569) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.115.Final.jar:4.1.115.Final]
	at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.ClassCastException: class net.minecraft.network.syncher.SynchedEntityData$DataItem cannot be cast to class net.minecraft.network.syncher.SynchedEntityData$DataValue (net.minecraft.network.syncher.SynchedEntityData$DataItem and net.minecraft.network.syncher.SynchedEntityData$DataValue are in unnamed module of loader java.net.URLClassLoader @4dcbadb4)
	at net.minecraft.network.protocol.game.ClientboundSetEntityDataPacket.pack(ClientboundSetEntityDataPacket.java:23) ~[paper-1.21.4.jar:1.21.4-78-49d15f6]
	at net.minecraft.network.protocol.game.ClientboundSetEntityDataPacket.write(ClientboundSetEntityDataPacket.java:44) ~[paper-1.21.4.jar:1.21.4-78-49d15f6]
	at net.minecraft.network.codec.StreamCodec$2.encode(StreamCodec.java:40) ~[paper-1.21.4.jar:1.21.4-78-49d15f6]
	at net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:90) ~[paper-1.21.4.jar:1.21.4-78-49d15f6]
	at net.minecraft.network.codec.StreamCodec$5.encode(StreamCodec.java:80) ~[paper-1.21.4.jar:1.21.4-78-49d15f6]
	at net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:53) ~[paper-1.21.4.jar:1.21.4-78-49d15f6]
	... 38 more
[21:24:13 INFO]: Kxgano lost connection: Internal Exception: io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:set_entity_data'
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