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Failed to start the minecraft server
java.lang.NullPointerException
        at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:
213) ~[spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at com.google.common.collect.Lists$ReverseList.<init>(Lists.java:767) ~[
spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at com.google.common.collect.Lists.reverse(Lists.java:759) ~[spigot-1.8.
8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.UserCache.b(UserCache.java:191) ~[spigot
-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.UserCache.<init>(UserCache.java:70) ~[sp
igot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.<init>(MinecraftServer.j
ava:132) ~[spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.DedicatedServer.<init>(DedicatedServer.j
ava:43) ~[spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.main(MinecraftServer.jav
a:923) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at org.bukkit.craftbukkit.Main.main(Main.java:193) [spigot-1.8.8.jar:git
-Spigot-21fe707-e1ebe52]
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