Problem/Bug Can someone help me figure whats wrong?

Can someone help me figure out whats wrong? This server is running 1.8.3 spigot/craftbukkit. Here is one of the crash reports. Plz help me!


---- Minecraft Crash Report ----
// I bet Cylons wouldn't have this problem.

Time: 3/28/15 3:55 PM
Description: Exception in server tick loop

java.net.UnknownHostException: 174.27.233.58
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$2.lookupAllHostAddr(Unknown Source)
at java.net.InetAddress.getAddressesFromNameService(Unknown Source)
at java.net.InetAddress.getAllByName0(Unknown Source)
at java.net.InetAddress.getAllByName(Unknown Source)
at java.net.InetAddress.getAllByName(Unknown Source)
at java.net.InetAddress.getByName(Unknown Source)
at net.minecraft.server.v1_8_R2.DedicatedServer.init(DedicatedServer.java:160)
at net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:501)
at java.lang.Thread.run(Unknown Source)


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

-- System Details --
Details:
Minecraft Version: 1.8.3
Operating System: Windows 8.1 (amd64) version 6.3
CPU: 4x AMD A10-6800K APU with Radeon(tm) HD Graphics
Java Version: 1.8.0_40, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 220390888 bytes (210 MB) / 267911168 bytes (255 MB) up to 954728448 bytes (910 MB)
JVM Flags: 1 total; -Xmx1024M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
CraftBukkit Information:
Running:
Failed to handle CraftCrashReport:
java.lang.NullPointerException
at org.bukkit.Bukkit.getName(Bukkit.java:86)
at org.bukkit.craftbukkit.v1_8_R2.CraftCrashReport.call(CraftCrashReport.java:20)
at net.minecraft.server.v1_8_R2.CrashReportSystemDetails.a(SourceFile:78)
at net.minecraft.server.v1_8_R2.CrashReport.h(CrashReport.java:136)
at net.minecraft.server.v1_8_R2.CrashReport.<init>(CrashReport.java:34)
at net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:551)
at java.lang.Thread.run(Unknown Source)

Profiler Position: N/A (disabled)
Is Modded: ~~ERROR~~ NullPointerException: null
Type: Dedicated Server (map_server.txt)

 

In your server.proerties leave server-ip blank.

 

ya but if I leave the ip blank then nowone can join. I want all my friends to be able to join

and then how do people connect to the server?

EDIT by Timtower: merged posts

 

Leaving it blank will use the default IP it finds, setting the ip will force it to use that one and crash(like above) if it doesn't find it.

 

so wat will they use to join the server?

 

Your external IP, if you don't know what it is, go to Google and type "What is my IP?"

 

it still doesn't work. I can join but I went on my bros account and he cant join

 

@hunterwinter11 You would have to port-forward so other people can join your server. I'd give you instructions on how to do it, but this process is different for every router.

 

do u know how to do it for a Zyxel Z1000Z which is a century link modem

 

After a quick google search, I found this:
http://portforward.com/english/routers/port_forwarding/ZyXEL/Q1000Z/Minecraft_Server.htm

Keep in mind:

1. I am not familiar with this site, so proceed with caution.
2. Keep track of ANY changes you make as you may need to undo them in a later time.