[20:59:02] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.util.ReportedException: Ticking entity
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:937) ~[MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:433) ~[lj.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:774) ~[MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:637) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.7.0_67]
Caused by: java.lang.IllegalArgumentException: n must be positive
at java.util.Random.nextInt(Unknown Source) ~[?:1.7.0_67]
at net.minecraft.enchantment.EnchantmentHelper.func_77508_a(EnchantmentHelper.java:184) ~[aeh.class:?]
at net.minecraft.entity.EntityLivingBase.func_70672_c(EntityLivingBase.java:1261) ~[rh.class:?]
at net.minecraft.entity.player.EntityPlayer.func_70665_d(EntityPlayer.java:1230) ~[xl.class:?]
at net.minecraft.entity.EntityLivingBase.func_70097_a(EntityLivingBase.java:906) ~[rh.class:?]
at net.minecraft.entity.player.EntityPlayer.func_70097_a(EntityPlayer.java:1145) ~[xl.class:?]
at net.minecraft.entity.player.EntityPlayerMP.func_70097_a(EntityPlayerMP.java:651) ~[mm.class:?]
at net.minecraft.world.Explosion.func_77278_a(Explosion.java:202) ~[afi.class:?]
at net.minecraft.world.World.func_72885_a(World.java:2957) ~[afn.class:?]
at net.minecraft.world.WorldServer.func_72885_a(WorldServer.java:1146) ~[mj.class:?]
at net.minecraft.entity.monster.EntityCreeper.func_146077_cc(EntityCreeper.java:276) ~[wl.class:?]
at net.minecraft.entity.monster.EntityCreeper.func_70071_h_(EntityCreeper.java:151) ~[wl.class:?]
at net.minecraft.world.World.func_72866_a(World.java:2613) ~[afn.class:?]
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:841) ~[mj.class:?]
at net.minecraft.world.World.func_72870_g(World.java:2567) ~[afn.class:?]
at net.minecraft.world.World.func_72939_s(World.java:2392) ~[afn.class:?]
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:672) ~[mj.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:920) ~[MinecraftServer.class:?]
... 4 more
[20:59:02] [Server thread/ERROR]:  Cause of unexpected exception was
java.lang.IllegalArgumentException: n must be positive
at java.util.Random.nextInt(Unknown Source) ~[?:1.7.0_67]
at net.minecraft.enchantment.EnchantmentHelper.func_77508_a(EnchantmentHelper.java:184) ~[aeh.class:?]
at net.minecraft.entity.EntityLivingBase.func_70672_c(EntityLivingBase.java:1261) ~[rh.class:?]
at net.minecraft.entity.player.EntityPlayer.func_70665_d(EntityPlayer.java:1230) ~[xl.class:?]
at net.minecraft.entity.EntityLivingBase.func_70097_a(EntityLivingBase.java:906) ~[rh.class:?]
at net.minecraft.entity.player.EntityPlayer.func_70097_a(EntityPlayer.java:1145) ~[xl.class:?]
at net.minecraft.entity.player.EntityPlayerMP.func_70097_a(EntityPlayerMP.java:651) ~[mm.class:?]
at net.minecraft.world.Explosion.func_77278_a(Explosion.java:202) ~[afi.class:?]
at net.minecraft.world.World.func_72885_a(World.java:2957) ~[afn.class:?]
at net.minecraft.world.WorldServer.func_72885_a(WorldServer.java:1146) ~[mj.class:?]
at net.minecraft.entity.monster.EntityCreeper.func_146077_cc(EntityCreeper.java:276) ~[wl.class:?]
at net.minecraft.entity.monster.EntityCreeper.func_70071_h_(EntityCreeper.java:151) ~[wl.class:?]
at net.minecraft.world.World.func_72866_a(World.java:2613) ~[afn.class:?]
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:841) ~[mj.class:?]
at net.minecraft.world.World.func_72870_g(World.java:2567) ~[afn.class:?]
at net.minecraft.world.World.func_72939_s(World.java:2392) ~[afn.class:?]
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:672) ~[mj.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:920) ~[MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:433) ~[lj.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:774) ~[MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:637) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.7.0_67]
[20:59:02] [Server thread/ERROR]: This crash report has been saved to: D:\beamwu\172\1.7.2\服务端\.\crash-reports\crash-2015-02-11_20.59.02-server.txt

似乎是MOD，

插件和你的服务端bukkit冲突