Heavy Spleef error

[Server thread/INFO]: [HeavySpleef] Enabling HeavySpleef vDev 1.5
[15:51:07] [Server thread/INFO]: [HeavySpleef] Could not find a config file! Creating a new...
[15:51:07] [Server thread/INFO]: [HeavySpleef] Config File successfully created!
[15:51:07] [Server thread/INFO]: [HeavySpleef] Loaded 0 games!
[15:51:07] [Server thread/ERROR]: Error occurred while enabling HeavySpleef vDev 1.5 (Is it up to date?)
java.lang.ArrayIndexOutOfBoundsException: 0
	at de.matzefratze123.api.gui.GuiInventory.setLines(GuiInventory.java:87) ~[?:?]
	at de.matzefratze123.heavyspleef.objects.InventoryJoinGUI.refresh(InventoryJoinGUI.java:57) ~[?:?]
	at de.matzefratze123.heavyspleef.objects.InventoryJoinGUI.<init>(InventoryJoinGUI.java:48) ~[?:?]
	at de.matzefratze123.heavyspleef.HeavySpleef.onEnable(HeavySpleef.java:138) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:218) ~[spigot.jar:git-Spigot-1225]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457) [spigot.jar:git-Spigot-1225]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:385) [spigot.jar:git-Spigot-1225]
	at org.bukkit.craftbukkit.v1_7_R1.CraftServer.loadPlugin(CraftServer.java:302) [spigot.jar:git-Spigot-1225]
	at org.bukkit.craftbukkit.v1_7_R1.CraftServer.enablePlugins(CraftServer.java:284) [spigot.jar:git-Spigot-1225]
	at net.minecraft.server.v1_7_R1.MinecraftServer.m(MinecraftServer.java:348) [spigot.jar:git-Spigot-1225]
	at net.minecraft.server.v1_7_R1.MinecraftServer.g(MinecraftServer.java:325) [spigot.jar:git-Spigot-1225]
	at net.minecraft.server.v1_7_R1.MinecraftServer.a(MinecraftServer.java:281) [spigot.jar:git-Spigot-1225]
	at net.minecraft.server.v1_7_R1.DedicatedServer.init(DedicatedServer.java:186) [spigot.jar:git-Spigot-1225]
	at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:430) [spigot.jar:git-Spigot-1225]
	at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [spigot.jar:git-Spigot-1225]
[15:51:07]