It crashes when i want to make a new one, i don't know if it affects already existing worlds
Additional Information: It does not create a world file/folder.
Also tried it with nogui(because the GUI still gives an exception when starting for a reason unknown)

Log file before crash:
[15:36:49] [Server thread/INFO]: Starting minecraft server version 14w10a
[15:36:49] [Server thread/INFO]: Loading properties
[15:36:49] [Server thread/INFO]: Default game type: SURVIVAL
[15:36:49] [Server thread/INFO]: Generating keypair
[15:36:49] [Server thread/INFO]: Starting Minecraft server on *:25565
[15:36:49] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.NullPointerException
at pe.a(SourceFile:287) ~[minecraft_server.14w10a.jar:?]
at my.aF(SourceFile:426) ~[minecraft_server.14w10a.jar:?]
at my.g(SourceFile:145) ~[minecraft_server.14w10a.jar:?]
at net.minecraft.server.MinecraftServer.run(SourceFile:367) [minecraft_server.14w10a.jar:?]
at mp.run(SourceFile:667) [minecraft_server.14w10a.jar:?]
[15:36:49] [Server thread/ERROR]: This crash report has been saved to: C:\Users\Brian\Desktop\MCServer\.\crash-reports\crash-2014-03-06_15.36.49-server.txt

Crash report:

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 3/6/14 3:36 PM
Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
at pe.a(SourceFile:287)
at my.aF(SourceFile:426)
at my.g(SourceFile:145)
at net.minecraft.server.MinecraftServer.run(SourceFile:367)
at mp.run(SourceFile:667)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– System Details –
Details:
Minecraft Version: 14w10a
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.7.0_60-ea, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 96327584 bytes (91 MB) / 128450560 bytes (122 MB) up to 1901592576 bytes (1813 MB)
JVM Flags: 0 total;
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Profiler Position: N/A (disabled)
Is Modded: Unknown (can't tell)
Type: Dedicated Server (map_server.txt)