Server login failed

Trying to log into my vanilla server, kicks me with "Internal server error".

Server log:

2013-09-02 18:51:25 [INFO] Starting minecraft server version 1.6.2
2013-09-02 18:51:25 [INFO] Loading properties
2013-09-02 18:51:25 [INFO] Default game type: CREATIVE
2013-09-02 18:51:25 [INFO] Generating keypair
2013-09-02 18:51:26 [INFO] Starting Minecraft server on *:35756
2013-09-02 18:51:26 [WARNING] Failed to load operators list: java.io.FileNotFoundException: .\ops.txt (A rendszer nem találja a megadott fájlt)
2013-09-02 18:51:26 [WARNING] Failed to load white-list: java.io.FileNotFoundException: .\white-list.txt (A rendszer nem találja a megadott fájlt)
2013-09-02 18:51:26 [INFO] Preparing level "sr"
2013-09-02 18:51:26 [INFO] Preparing start region for level 0
2013-09-02 18:51:27 [INFO] Preparing spawn area: 11%
2013-09-02 18:51:28 [INFO] Preparing spawn area: 22%
2013-09-02 18:51:29 [INFO] Preparing spawn area: 40%
2013-09-02 18:51:30 [INFO] Preparing spawn area: 56%
2013-09-02 18:51:31 [INFO] Preparing spawn area: 74%
2013-09-02 18:51:32 [INFO] Preparing spawn area: 94%
2013-09-02 18:51:32 [INFO] Done (6,686s)! For help, type "help" or "?"
2013-09-02 18:51:37 [INFO] Disconnecting matekos17 [/25.68.201.220:51314]: Internal server error
2013-09-02 18:51:37 [WARNING] Failed to handle packet for matekos17 [/25.68.201.220:51314]: java.lang.IllegalArgumentException: n must be positive
java.lang.IllegalArgumentException: n must be positive
	at java.util.Random.nextInt(Unknown Source)
	at ju.<init>(SourceFile:63)
	at hm.a(SourceFile:274)
	at jx.e(SourceFile:158)
	at jx.d(SourceFile:53)
	at ix.a(SourceFile:44)
	at iw.b(SourceFile:29)
	at net.minecraft.server.MinecraftServer.t(SourceFile:488)
	at ir.t(SourceFile:262)
	at net.minecraft.server.MinecraftServer.s(SourceFile:405)
	at net.minecraft.server.MinecraftServer.run(SourceFile:339)
	at hh.run(SourceFile:582)
2013-09-02 18:51:37 [SEVERE] Reached end of stream for /25.68.201.220
2013-09-02 18:51:40 [INFO] Disconnecting matekos17 [/25.68.201.220:51325]: Internal server error
2013-09-02 18:51:40 [WARNING] Failed to handle packet for matekos17 [/25.68.201.220:51325]: java.lang.IllegalArgumentException: n must be positive
java.lang.IllegalArgumentException: n must be positive
	at java.util.Random.nextInt(Unknown Source)
	at ju.<init>(SourceFile:63)
	at hm.a(SourceFile:274)
	at jx.e(SourceFile:158)
	at jx.d(SourceFile:53)
	at ix.a(SourceFile:44)
	at iw.b(SourceFile:29)
	at net.minecraft.server.MinecraftServer.t(SourceFile:488)
	at ir.t(SourceFile:262)
	at net.minecraft.server.MinecraftServer.s(SourceFile:405)
	at net.minecraft.server.MinecraftServer.run(SourceFile:339)
	at hh.run(SourceFile:582)
2013-09-02 18:51:40 [SEVERE] Reached end of stream for /25.68.201.220