Errors after arena start

[MattiGB]

After starting arena I have in my console:

[22:30:47]` [Server thread/ERROR]: Could not pass event EntityDamageByEntityEvent to McInfected v1.4.1
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot.jar:git-Spigot-798f32d-0cd0397]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-798f32d-0cd0397]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-798f32d-0cd0397]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-798f32d-0cd0397]
at org.bukkit.craftbukkit.v1_9_R2.event.CraftEventFactory.callEvent(CraftEventFactory.java:89) [spigot.jar:git-Spigot-798f32d-0cd0397]
at org.bukkit.craftbukkit.v1_9_R2.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:570) [spigot.jar:git-Spigot-798f32d-0cd0397]
at org.bukkit.craftbukkit.v1_9_R2.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:479) [spigot.jar:git-Spigot-798f32d-0cd0397]
at org.bukkit.craftbukkit.v1_9_R2.event.CraftEventFactory.handleLivingEntityDamageEvent(CraftEventFactory.java:602) [spigot.jar:git-Spigot-798f32d-0cd0397]
at net.minecraft.server.v1_9_R2.EntityLiving.damageEntity0(EntityLiving.java:1216) [spigot.jar:git-Spigot-798f32d-0cd0397]
at net.minecraft.server.v1_9_R2.EntityHuman.damageEntity0(EntityHuman.java:842) [spigot.jar:git-Spigot-798f32d-0cd0397]
at net.minecraft.server.v1_9_R2.EntityLiving.damageEntity(EntityLiving.java:827) [spigot.jar:git-Spigot-798f32d-0cd0397]
at net.minecraft.server.v1_9_R2.EntityHuman.damageEntity(EntityHuman.java:766) [spigot.jar:git-Spigot-798f32d-0cd0397]
at net.minecraft.server.v1_9_R2.EntityPlayer.damageEntity(EntityPlayer.java:495) [spigot.jar:git-Spigot-798f32d-0cd0397]
at net.minecraft.server.v1_9_R2.EntityArrow.a(EntityArrow.java:278) [spigot.jar:git-Spigot-798f32d-0cd0397]
at net.minecraft.server.v1_9_R2.EntityArrow.m(EntityArrow.java:189) [spigot.jar:git-Spigot-798f32d-0cd0397]
at net.minecraft.server.v1_9_R2.EntityTippedArrow.m(EntityTippedArrow.java:68) [spigot.jar:git-Spigot-798f32d-0cd0397]
at net.minecraft.server.v1_9_R2.World.entityJoinedWorld(World.java:1617) [spigot.jar:git-Spigot-798f32d-0cd0397]
at net.minecraft.server.v1_9_R2.World.g(World.java:1592) [spigot.jar:git-Spigot-798f32d-0cd0397]
at net.minecraft.server.v1_9_R2.World.tickEntities(World.java:1426) [spigot.jar:git-Spigot-798f32d-0cd0397]
at net.minecraft.server.v1_9_R2.WorldServer.tickEntities(WorldServer.java:632) [spigot.jar:git-Spigot-798f32d-0cd0397]
at net.minecraft.server.v1_9_R2.MinecraftServer.D(MinecraftServer.java:797) [spigot.jar:git-Spigot-798f32d-0cd0397]
at net.minecraft.server.v1_9_R2.DedicatedServer.D(DedicatedServer.java:399) [spigot.jar:git-Spigot-798f32d-0cd0397]
at net.minecraft.server.v1_9_R2.MinecraftServer.C(MinecraftServer.java:665) [spigot.jar:git-Spigot-798f32d-0cd0397]
at net.minecraft.server.v1_9_R2.MinecraftServer.run(MinecraftServer.java:564) [spigot.jar:git-Spigot-798f32d-0cd0397]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_77]
Caused by: java.lang.IllegalArgumentException: bound must be positive
at java.util.Random.nextInt(Random.java:388) ~[?:1.8.0_77]
at com.bimmr.mcinfected.Lobbys.Lobby.teleportToArena(Lobby.java:443) ~[?:?]
at com.bimmr.mcinfected.IPlayers.IPlayer.respawn(IPlayer.java:834) ~[?:?]
at com.bimmr.mcinfected.IPlayers.IPlayer.die(IPlayer.java:151) ~[?:?]
at com.bimmr.mcinfected.Listeners.EntityDamageByEntity.onPlayerDamage(EntityDamageByEntity.java:169) ~[?:?]
at sun.reflect.GeneratedMethodAccessor48.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_77]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_77]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot.jar:git-Spigot-798f32d-0cd0397]
... 24 more

And it spams a lot!
My spigot version is 1.9.4 (no bungee)

[Bimmr]

Can I see your Lobbys.yml

[MattiGB]

Well I deleted all files :/
I can start server again from begining.

[Bimmr]

Chances are you didn't have spawns for one of the teams. But you deleted the config so I'm not able to solve this issue if you no longer have it.