Information

Environment information
Plugin + server version info:

> backpack version
[10:45:48 INFO]: Only "/backpack reload" is available at the moment!
(plugin: 2.3.20, server: git-Paper-265 (MC: 1.16.4), java: version "1.8.0_265")

Online mode: yes

BungeeCord: no

Server/crash log

https://pastebin.com/puDuHVcD

Plugin config (optional)

https://pastebin.com/JjWWC4EJ

Details

Description
The error has occurred since the update to 1.16.4

Steps to reproduce

Expected behavior

Other information (e.g. detailed explanation, related issues, suggestions how to fix, links for us to have context, screenshots, etc.)

Please try if adding this to your plugins solves the problem for you.

It works. thank you :)