This is my code:

private void registerPacketListeners() { ProtocolLibrary.getProtocolManager().addPacketListener((PacketListener)new ClientMoveHandler.PacketListening((Plugin)this)); ProtocolLibrary.getProtocolManager().addPacketListener((PacketListener)new ClientEntityUnmountListener((Plugin)this)); ProtocolLibrary.getProtocolManager().addPacketListener((PacketListener)new MountListener(this)); }

This is my error:

java.lang.NullPointerException: Cannot invoke "com.comphenix.protocol.ProtocolManager.addPacketListener(com.comphenix.protocol.events.PacketListener)" because the return value of "com.comphenix.protocol.ProtocolLibrary.getProtocolManager()" is null

Hi,
you're either not depending on ProtocolLib or you accidentally shaded ProtocolLib into your plugin.

Just make sure that (if you are using maven) the ProtocolLib dependency scope is provided (if you are using gradle use compileOnly over implementation or api)

How do you mean?

I use ProtocolLib for Packets and PacketEvents

This is the whole error

Thx

I use Maven how can is provided it?

  <dependency>
    <groupId>com.comphenix.protocol</groupId>
    <artifactId>ProtocolLib</artifactId>
    <version>4.8.0</version>
    <scope>provided</scope>
  </dependency>

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