This error is related to a problem sending packets, and occurs due to an unexpected null value that should represent a packet or structure type. The main error appears on the line:
java.lang.NullPointerException: type cannot be null in com.google.common.base.Preconditions.checkNotNull(Preconditions.java:229)
This error points out that some mandatory parameter is null when sending a specific packet (PacketPlayOutSpawnEntity). This typically happens on servers with plugins that use ProtocolLib or similar libraries, where network packets are intercepted or modified before being sent to the client.
Jar 1.8.8 server
This error is related to a problem sending packets, and occurs due to an unexpected null value that should represent a packet or structure type. The main error appears on the line:
java.lang.NullPointerException: type cannot be null in com.google.common.base.Preconditions.checkNotNull(Preconditions.java:229)
This error points out that some mandatory parameter is null when sending a specific packet (PacketPlayOutSpawnEntity). This typically happens on servers with plugins that use ProtocolLib or similar libraries, where network packets are intercepted or modified before being sent to the client.