[16:27:15] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing 'class customize' in class
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:148) ~[spigot.jar:git-Spigot-79a30d7-acbc348]
	at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:648) ~[spigot.jar:git-Spigot-79a30d7-acbc348]
	at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1401) [spigot.jar:git-Spigot-79a30d7-acbc348]
	at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1236) [spigot.jar:git-Spigot-79a30d7-acbc348]
	at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot.jar:git-Spigot-79a30d7-acbc348]
	at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot.jar:git-Spigot-79a30d7-acbc348]
	at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot.jar:git-Spigot-79a30d7-acbc348]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_211]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_211]
	at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [spigot.jar:git-Spigot-79a30d7-acbc348]
	at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:748) [spigot.jar:git-Spigot-79a30d7-acbc348]
	at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [spigot.jar:git-Spigot-79a30d7-acbc348]
	at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [spigot.jar:git-Spigot-79a30d7-acbc348]
	at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [spigot.jar:git-Spigot-79a30d7-acbc348]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_211]
Caused by: java.lang.NullPointerException
	at com.sucy.skill.api.classes.RPGClass.getToolIcon(RPGClass.java:328) ~[SkillAPI%20(1).jar:?]
	at com.sucy.skill.gui.tool.GUITool.populateClassSelection(GUITool.java:421) ~[SkillAPI%20(1).jar:?]
	at com.sucy.skill.gui.tool.GUITool.populate(GUITool.java:354) ~[SkillAPI%20(1).jar:?]
	at com.sucy.skill.gui.tool.GUITool.setType(GUITool.java:316) ~[SkillAPI%20(1).jar:?]
	at com.sucy.skill.gui.tool.GUITool.open(GUITool.java:306) ~[SkillAPI%20(1).jar:?]
	at com.sucy.skill.cmd.CmdCustomize.execute(CmdCustomize.java:56) ~[SkillAPI%20(1).jar:?]
	at com.rit.sucy.commands.ConfigurableCommand.execute(ConfigurableCommand.java:550) ~[MCCore.jar:?]
	at com.rit.sucy.commands.ConfigurableCommand.execute(ConfigurableCommand.java:558) ~[MCCore.jar:?]
	at com.rit.sucy.commands.ConfigurableCommand.execute(ConfigurableCommand.java:516) ~[MCCore.jar:?]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot.jar:git-Spigot-79a30d7-acbc348]
	... 14 more