[Server thread/INFO]: [IslandCraft] Enabling IslandCraft v1.0.4 [Server thread/ERROR]: [IslandCraft] IslandCraft does not currently support this CraftBukkit version [Server thread/ERROR]: [IslandCraft] Check for updates at http://dev.bukkit.org/bukkit-plugins/islandcraft/

Plugin not working on 1.9.4 please fix

Thanks for the heads up! I've pushed out an update. It'll be on BukkitDev as soon as it's approved, or you can grab it here: https://github.com/hoqhuuep/IslandCraft/releases/tag/v1.0.5