Issue when player breaking a any block

[Former user]

Hello, everytime when non OP player destroys a block this error will appear:

[23:04:40 ERROR]: Skipped item: No enum constant org.bukkit.Material.GRASS_PATH [23:04:41 ERROR]: Skipped item: No enum constant org.bukkit.Material.GRASS_PATH [23:04:41 ERROR]: Skipped item: No enum constant org.bukkit.Material.GRASS_PATH

I dont know how to fix it and sometime it lags a server :/

[Hans Kurel]

This is happening because GRASS_PATH is in your config, but no Material with that name exists in your server version. You have to replace it with a correct name. Check your server version JavaDoc to do that.

Are you sure this is causing the lag? I don't see how this could be possible.

[Hans Kurel]

If you have any more issues with this, feel free to let me know.