YTBox - Error

[15:38:06] [Server thread/INFO]: [YTB] Enabling YTBox v1.1.1
[15:38:06] [Server thread/ERROR]: Error occurred while enabling YTBox v1.1.1 (Is it up to date?)
java.lang.NullPointerException
    at org.bukkit.Location.getBlock(Location.java:87) ~[spigot.jar:git-Spigot-21fe707-e1ebe52]
    at me.BukkitPVP.YTBox.Box.getSign(Box.java:124) ~[?:?]
    at me.BukkitPVP.YTBox.Box.updateSign(Box.java:77) ~[?:?]
    at me.BukkitPVP.YTBox.Box.<init>(Box.java:22) ~[?:?]
    at me.BukkitPVP.YTBox.Main.onEnable(Main.java:49) ~[?:?]
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot.jar:git-Spigot-21fe707-e1ebe52]
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340) [spigot.jar:git-Spigot-21fe707-e1ebe52]
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot.jar:git-Spigot-21fe707-e1ebe52]
    at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357) [spigot.jar:git-Spigot-21fe707-e1ebe52]
    at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317) [spigot.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:414) [spigot.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:378) [spigot.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:333) [spigot.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:263) [spigot.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:525) [spigot.jar:git-Spigot-21fe707-e1ebe52]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_66]