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Name cannot be null
java.lang.IllegalArgumentException: Name cannot be null	at org.apache.commons.lang.Validate.notNull(Validate.java:192)	at org.bukkit.Material.matchMaterial(Material.java:609)	at net.mercilessmc.Hub.HubEssentials.configSetup(HubEssentials.java:357)	at net.mercilessmc.Hub.HubEssentials.reload(HubEssentials.java:379)	at net.mercilessmc.Hub.HubEssentials.onEnable(HubEssentials.java:98)	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:316)	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:332)	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:412)	at org.bukkit.craftbukkit.v1_7_R4.CraftServer.loadPlugin(CraftServer.java:476)	at org.bukkit.craftbukkit.v1_7_R4.CraftServer.enablePlugins(CraftServer.java:394)	at net.minecraft.server.v1_7_R4.MinecraftServer.n(MinecraftServer.java:360)	at net.minecraft.server.v1_7_R4.MinecraftServer.g(MinecraftServer.java:334)	at net.minecraft.server.v1_7_R4.MinecraftServer.a(MinecraftServer.java:290)	at net.minecraft.server.v1_7_R4.DedicatedServer.init(DedicatedServer.java:210)	at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:458)	at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628)