Solved I can not startup my server.

I get this error after the server is done loading:

Code:

16:12:07 [SEVERE] net.minecraft.server.ReportedException: Exception while tickin
g a block
16:12:07 [SEVERE] at net.minecraft.server.MinecraftServer.r(MinecraftServe
r.java:573)
16:12:07 [SEVERE] at net.minecraft.server.DedicatedServer.r(DedicatedServe
r.java:222)
16:12:07 [SEVERE] at net.minecraft.server.MinecraftServer.q(MinecraftServe
r.java:493)
16:12:07 [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftSer
ver.java:426)
16:12:07 [SEVERE] at net.minecraft.server.ThreadServerApplication.run(Sour
ceFile:856)
16:12:07 [SEVERE] Caused by: java.lang.NullPointerException
16:12:07 [SEVERE] at java.util.Collections.shuffle(Unknown Source)
16:12:07 [SEVERE] at java.util.Collections.shuffle(Unknown Source)
16:12:07 [SEVERE] at net.minecraft.server.PlayerSelector.getPlayers(Source
File:84)
16:12:07 [SEVERE] at net.minecraft.server.TileEntityCommand.buildCommands(
TileEntityCommand.java:78)
16:12:07 [SEVERE] at net.minecraft.server.TileEntityCommand.a(TileEntityCo
mmand.java:57)
16:12:07 [SEVERE] at net.minecraft.server.BlockCommand.b(BlockCommand.java
:45)
16:12:07 [SEVERE] at net.minecraft.server.WorldServer.a(WorldServer.java:4
83)
16:12:07 [SEVERE] at net.minecraft.server.WorldServer.doTick(WorldServer.j
ava:172)
16:12:07 [SEVERE] at net.minecraft.server.MinecraftServer.r(MinecraftServe
r.java:569)
16:12:07 [SEVERE] ... 4 more
16:12:07 [SEVERE] Encountered an unexpected exception ReportedException
net.minecraft.server.ReportedException: Exception while ticking a block
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:573)
at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
Caused by: java.lang.NullPointerException
at java.util.Collections.shuffle(Unknown Source)
at java.util.Collections.shuffle(Unknown Source)
at net.minecraft.server.PlayerSelector.getPlayers(SourceFile:84)
at net.minecraft.server.TileEntityCommand.buildCommands(TileEntityComman
d.java:78)
at net.minecraft.server.TileEntityCommand.a(TileEntityCommand.java:57)
at net.minecraft.server.BlockCommand.b(BlockCommand.java:45)
at net.minecraft.server.WorldServer.a(WorldServer.java:483)
at net.minecraft.server.WorldServer.doTick(WorldServer.java:172)
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:569)
... 4 more

Can't find whats wrong :S

nvm.. fixed it!

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

How did you fix this? I have the same issue!