新人报到，服务器突然启动不了，

附件：run server now , you can’t close
Loading libraries, please wait…
Failed to start the minecraft server
java.lang.NullPointerException
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:213) ~[spigot-1.8.8-R0.1-SNAPSHOT.jar:git-Spigot-5f38d38-18fbb24]
at com.google.common.collect.Lists$ReverseList.<init>(Lists.java:767) ~[spigot-1.8.8-R0.1-SNAPSHOT.jar:git-Spigot-5f38d38-18fbb24]
at com.google.common.collect.Lists.reverse(Lists.java:759) ~[spigot-1.8.8-R0.1-SNAPSHOT.jar:git-Spigot-5f38d38-18fbb24]
at net.minecraft.server.v1_8_R3.UserCache.b(UserCache.java:191) ~[spigot-1.8.8-R0.1-SNAPSHOT.jar:git-Spigot-5f38d38-18fbb24]
at net.minecraft.server.v1_8_R3.UserCache.<init>(UserCache.java:70) ~[spigot-1.8.8-R0.1-SNAPSHOT.jar:git-Spigot-5f38d38-18fbb24]
at net.minecraft.server.v1_8_R3.MinecraftServer.<init>(MinecraftServer.java:132) ~[spigot-1.8.8-R0.1-SNAPSHOT.jar:git-Spigot-5f38d38-18fbb24]
at net.minecraft.server.v1_8_R3.DedicatedServer.<init>(DedicatedServer.java:43) ~[spigot-1.8.8-R0.1-SNAPSHOT.jar:git-Spigot-5f38d38-18fbb24]
at net.minecraft.server.v1_8_R3.MinecraftServer.main(MinecraftServer.java:923) [spigot-1.8.8-R0.1-SNAPSHOT.jar:git-Spigot-5f38d38-18fbb24]
at org.bukkit.craftbukkit.Main.main(Main.java:193) [spigot-1.8.8-R0.1-SNAPSHOT.jar:git-Spigot-5f38d38-18fbb24]

求帮忙