서버 열면

[INFO] Preparing level "world"
[INFO] Preparing start region
[SEVERE] Unexpected exception
java.lang.NullPointerException
at gc.b(SourceFile:83)
at fv.a(SourceFile:1659)
at me.d(SourceFile:480)
at ly.d(SourceFile:93)
at ly.b(SourceFile:115)
at fv.c(SourceFile:417)
at fv.a(SourceFile:374)
at fv.e(SourceFile:378)
at fv.a(SourceFile:282)
at ko.a(SourceFile:52)
at fv.<init>(SourceFile:255)
at gc.<init>(SourceFile:32)
at net.minecraft.server.MinecraftServer.c(SourceFile:150)
at net.minecraft.server.MinecraftServer.d(SourceFile:141)
at net.minecraft.server.MinecraftServer.run(SourceFile:216)
at cu.run(SourceFile:512)

라고 뜨는데 잘 열은거 맞ㅇ므??
뭔가 이상함 ㅜㅠ