Add orange to your code.

[Soledge]

Error occurred while enabling DiabloDrops v2.5.1 (Is it up to date?)
java.lang.IllegalArgumentException: No enum constant org.bukkit.ChatColor.ORANGE
at java.lang.Enum.valueOf(Enum.java:236) ~[?:1.7.0_45]
at org.bukkit.ChatColor.valueOf(ChatColor.java:13) ~[spigot.jar:git-Spigot-1202]
at com.modcrafting.diablodrops.builders.TierBuilder.build(TierBuilder.java:65) ~[?:?]
at com.modcrafting.diablodrops.DiabloDrops.onEnable(DiabloDrops.java:187) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:218) ~[spigot.jar:git-Spigot-1202]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457) [spigot.jar:git-Spigot-1202]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:385) [spigot.jar:git-Spigot-1202]
at org.bukkit.craftbukkit.v1_7_R1.CraftServer.loadPlugin(CraftServer.java:302) [spigot.jar:git-Spigot-1202]
at org.bukkit.craftbukkit.v1_7_R1.CraftServer.enablePlugins(CraftServer.java:284) [spigot.jar:git-Spigot-1202]
at net.minecraft.server.v1_7_R1.DedicatedServer.init(DedicatedServer.java:134) [spigot.jar:git-Spigot-1202]
at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:430) [spigot.jar:git-Spigot-1202]
at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [spigot.jar:git-Spigot-1202]