nnn lost connection Internal Exception ionettyhandlercodecEncoderException javalangNullPointerException javautilNoSuchElementException packet_handler at MC-BOOTSTRAPionettytransport4177Finalion

The error message suggests that there was a lost connection due to an internal exception. The specific error is a java.lang.NullPointerException which means that a variable or object was expected to have a value, but it was found to be null.

The error trace indicates that the issue occurred in the ChannelExecutor class of the me.arasple.mc.trmenu.taboolib.module.nms package. It seems that the addPlayerChannel method encountered a NoSuchElementException while trying to add a channel to the channel pipeline.

This error can be caused by various factors, such as a missing or outdated dependency, an incompatible plugin version, or a configuration issue. It is recommended to check the plugin's documentation or contact the plugin developer for assistance in resolving this issue. Additionally, the message "A valid message group isn't found" suggests that there may be an issue with the join-quit.yml file. Double-checking the configuration file for any errors or missing values might help resolve the problem