求助、、、、开着服务端的电脑意外关机了

lcp1220

意外关机后变成这样了，进不了游戏了
求修复办法
[INFO] Starting minecraft server version Beta 1.4
[INFO] Loading properties
[INFO] Starting Minecraft server on *:25565
[WARNING] **** SERVER IS RUNNING IN OFFLINE/INSECURE MODE!
[WARNING] The server will make no attempt to authenticate usernames. Beware.
[WARNING] While this makes the game possible to play without internet access, it also opens up the ability for hackers to connect with any username they choose.
[WARNING] To change this, set "online-mode" to "true" in the server.settings file.
[INFO] Preparing level "world"
[INFO] Preparing start region
[SEVERE] Unexpected exception
java.lang.NullPointerException
at dc.b(SourceFile:72)
at cw.a(SourceFile:1558)
at gn.d(SourceFile:468)
at gk.c(SourceFile:66)
at gk.b(SourceFile:87)
at cw.c(SourceFile:295)
at cw.a(SourceFile:252)
at cw.e(SourceFile:256)
at cw.a(SourceFile:194)
at nd.a(SourceFile:51)
at cw.c(SourceFile:169)
at cw.<init>(SourceFile:148)
at dc.<init>(SourceFile:25)
at net.minecraft.server.MinecraftServer.a(SourceFile:178)
at net.minecraft.server.MinecraftServer.d(SourceFile:143)
at net.minecraft.server.MinecraftServer.run(SourceFile:246)
at bg.run(SourceFile:375)