Error, Null in String List

[Server thread/ERROR]: Error occurred while enabling InfoBoardReborn v3.0.0 (Is it up to date?)
java.lang.NullPointerException: null
	at com.infogroup.infoboard.scoreboard.Ladder.<init>(Ladder.java:29) ~[?:?]
	at com.infogroup.infoboard.scoreboard.InfoBoardManager.<init>(InfoBoardManager.java:42) ~[?:?]
	at com.infogroup.infoboard.InfoBoardReborn.Instances(InfoBoardReborn.java:66) ~[?:?]
	at com.infogroup.infoboard.InfoBoardReborn.onEnable(InfoBoardReborn.java:41) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:265) ~[spigot-1.13.2.jar:git-Spigot-1a3504a-dfa7583]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:347) [spigot-1.13.2.jar:git-Spigot-1a3504a-dfa7583]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:410) [spigot-1.13.2.jar:git-Spigot-1a3504a-dfa7583]
	at org.bukkit.craftbukkit.v1_13_R2.CraftServer.enablePlugin(CraftServer.java:436) [spigot-1.13.2.jar:git-Spigot-1a3504a-dfa7583]
	at org.bukkit.craftbukkit.v1_13_R2.CraftServer.enablePlugins(CraftServer.java:350) [spigot-1.13.2.jar:git-Spigot-1a3504a-dfa7583]
	at net.minecraft.server.v1_13_R2.MinecraftServer.l(MinecraftServer.java:580) [spigot-1.13.2.jar:git-Spigot-1a3504a-dfa7583]
	at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:542) [spigot-1.13.2.jar:git-Spigot-1a3504a-dfa7583]
	at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:420) [spigot-1.13.2.jar:git-Spigot-1a3504a-dfa7583]
	at net.minecraft.server.v1_13_R2.DedicatedServer.init(DedicatedServer.java:294) [spigot-1.13.2.jar:git-Spigot-1a3504a-dfa7583]
	at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:698) [spigot-1.13.2.jar:git-Spigot-1a3504a-dfa7583]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_181]