This version is made for Spigot 1.14. It probably won't work on older versions. You have to use 1.14 item names instead of 1.8 items now, see this: https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/Material.html . The data option in the config has been removed, you can remove it from your current config. I've also fixed an issue where server pinging would crash on unstable network connections. In this version, it automatically resumes when the network is back up.