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i need help,whit my server, i enter and play just fine.
but every time another person try to enter, it crash, or for example, another person is playing and when i enter it crash, 1 person can play fine , but no 2 or more

here si the crash report.

---- Minecraft Crash Report ----
// There are four lights!

Time: 13/04/14 11:24
Description: Exception in server tick loop

java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.ArrayList.elementData(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at net.minecraft.server.management.ServerConfigurationManager.func_72374_b(ServerConfigurationManager.java:1280)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:971)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:419)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:797)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:661)
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: 1.7.2
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 251220456 bytes (239 MB) / 643301376 bytes (613 MB) up to 1908932608 bytes (1820 MB)
JVM Flags: 3 total; -Xms524m -Xmx524m -Xmx2G
AABB Pool Size: 2441 (136696 bytes; 0 MB) allocated, 2203 (123368 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
FML: MCP v9.01-pre FML v7.2.116.36 Minecraft Forge 10.12.0.1033 14 mods loaded, 14 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.2.116.36} [Forge Mod Loader] (craftbukkit.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.12.0.1033} [Minecraft Forge] (craftbukkit.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TConstruct-Preloader{0.1.1} [Tinkers Corestruct] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
battlegear2{1.0.5.3} [Mine & Blade Battlegear 2 - Bullseye] ([1.7.2] Mine & Blade Battlegear 2 - Bullseye - 1.0.5.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BiblioCraft{1.6.3} [BiblioCraft] (BiblioCraft[1.6.3][MC1.7.2].jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
craftguide{1.5.2} [CraftGuide] (CraftGuide-1.6.8.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CustomSpawner{3.2.0.dev.R1} [DrZhark's CustomSpawner] (CustomMobSpawner 3.2.0-DEV-R2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
customnpcs{1.7.2-2} [CustomNpcs] (CustomNPCs-1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MoCreatures{6.2.0.dev.R1} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.2.0-DEV-R2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
inventorytweaks{1.57-dev-110} [Inventory Tweaks] (InventoryTweaks-1.57-dev-111.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Mantle{1.7.2-114.8c6a5a8} [Mantle] (Mantle-1.7.2-0.2.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TConstruct{1.7.2-1.6.0.jenkins438} [Tinkers' Construct] (TConstruct-1.7.2-1.6.0.a11.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TMechworks{1.7.2-48.583e8f7} [Tinkers' Mechworks] (TMechworks-1.7.2-0.2.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TConstruct Environment: Environment healthy.
Mantle Environment: DO NOT REPORT THIS CRASH! Unsupported mods in environment: bukkit
Profiler Position: N/A (disabled)
Vec3 Pool Size: 6280 (351680 bytes; 0 MB) allocated, 350 (19600 bytes; 0 MB) used
Player Count: 2 / 10; [EntityPlayerMP['Borogon'/971, l='Zettor', x=1963,37, y=71,50, z=342,79](Borogon at 1963.36990227584,71.5,342.78787696605957), EntityPlayerMP['ValeenMC54'/6755, l='Zettor', x=1968,50, y=73,00, z=336,50](ValeenMC54 at 1968.5,73.0,336.5)]
Is Modded: Definitely; Server brand changed to 'mcpc,craftbukkit,fml,forge'
Type: Dedicated Server (map_server.txt)


need help please.

It is not helpful at all if you do not give a list of what mods this server has. Most mods for 1.7.2 are still WIP mods and are not ready for serious play yet. Even Forge is still a fairly major WIP for 1.7.2 Minecraft.