[00:20:22] [main/FATAL]: Failed to start the minecraft server
java.lang.NullPointerException
        at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:213) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at com.google.common.collect.Lists$ReverseList.<init>(Lists.java:767) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at com.google.common.collect.Lists.reverse(Lists.java:759) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.UserCache.b(UserCache.java:191) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.UserCache.<init>(UserCache.java:70) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.<init>(MinecraftServer.java:132) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.DedicatedServer.<init>(DedicatedServer.java:43) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.main(MinecraftServer.java:923) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.Main.main(Main.java:193) [spigot.jar:git-Spigot-db6de12-18fbb24]