Type of bug

Error in console

/ess version output

[15:39:51 INFO]: Server version: 1.16.5-R0.1-SNAPSHOT git-Airplane-9 (MC: 1.16.5)
[15:39:51 INFO]: Brand version: Airplane
[15:39:51 INFO]: EssentialsX version: 2.19.0-dev+221-1556b91
[15:39:51 INFO]: PlaceholderAPI version: 2.10.9
[15:39:51 INFO]: GroupManager version: 3.0-SNAPSHOT (Phoenix)
[15:39:51 INFO]: Vault version: 1.7.3-b131
[15:39:51 INFO]: Citizens version: 2.0.27-SNAPSHOT (build 2164)
[15:39:51 INFO]: ChestShop version: 3.12 (build 307)
[15:39:51 INFO]: Towny version: 0.97.0.10
[15:39:51 INFO]: EssentialsXChat version: 2.19.0-dev+204-0b6b0f9
[15:39:51 INFO]: EssentialsXSpawn version: 2.19.0-dev+204-0b6b0f9
[15:39:51 INFO]: DiscordSRV version: 1.23.0
[15:39:51 INFO]: Economy Layer: Vault Compatibility Layer (iConomy 5.11)
[15:39:51 INFO]: Version mismatch! Please update all Essentials jars to the same version.
[15:39:51 INFO]: You are running unsupported plugins!
[15:39:51 INFO]: Fetching version information...
[15:39:51 INFO]: You're running the latest EssentialsX dev build!

Server startup log

https://mclo.gs/OQAN9Lk

EssentialsX config files

https://pastebin.com/x0H4aiNm

Error log (if applicable)

https://pastebin.com/XfmBB7fi

Bug description

Everytime someone joins (we have custom join messages) it doesn't broadcast that they joined and instead sends an error to console.

Steps to reproduce

1. Have custom join messages
2. Have someone join

Expected behaviour

It to broadcast that the player joined, not error.

Actual behaviour

It errors and doesn't send a join message

This seems like an issue with your server software as the issue appears to be an issue with it sending packets. Try updating your server and report it to Airplane if this continues.