Error code while starting the server
Server info
When i type /sk it shows
[21:53:22 INFO]: [Skript] Enabling Skript v2.5.3
[21:53:22 ERROR]: Error occurred while enabling Skript v2.5.3 (Is it up to date?)
java.lang.ExceptionInInitializerError: null
at ch.njol.skript.aliases.Aliases.<clinit>(Aliases.java:140) ~[?:?]
at ch.njol.skript.Skript.onEnable(Skript.java:403) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) ~[spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337) [spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:403) [spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:381) [spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:330) [spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.MinecraftServer.t(MinecraftServer.java:422) [spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.MinecraftServer.l(MinecraftServer.java:383) [spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.MinecraftServer.a(MinecraftServer.java:338) [spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:272) [spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:545) [spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_271]
Caused by: java.lang.IllegalArgumentException: No enum constant org.bukkit.Material.GRANITE
at java.lang.Enum.valueOf(Unknown Source) ~[?:1.8.0_271]
at org.bukkit.Material.valueOf(Material.java:1) ~[spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
at ch.njol.skript.aliases.MaterialRegistry.load(MaterialRegistry.java:60) ~[?:?]
at ch.njol.skript.aliases.ItemData.<clinit>(ItemData.java:100) ~[?:?]
... 13 more
Server info
MC version: 1.12.2
Spigot: git-Spigot-dcd1643-e60fc34
When i type /sk it shows
over and over/skript help