Plugin don't work with FlameCord (Bungee cord)

[JosGCS]

Plugin version: "6.4.13" Server type: "FlameCord" Proxy version: "1.2.4"

Describe the bug: The plugin does not start, but aborts the process with an error.

Expected behavior: I expected the plugin to start.

Steps to reproduce:

1. Install FlameCord
2. Install the plugin
3. See error:

java.lang.NoClassDefFoundError: me/egg82/antivpn/external/it/unimi/dsi/fastutils/IntList