Hi, i have a problem on my server.
Every time I start the server he falls, at the console report this error's:

12.02 20:53:04 [Server] ERROR The server has stopped responding!
12.02 20:53:04 [Server] ERROR Please report this to http://www.spigotmc.org/
12.02 20:53:04 [Server] ERROR Be sure to include ALL relevant console errors and Minecraft crash reports
12.02 20:53:04 [Server] ERROR Spigot version: git-Spigot-1502 (MC: 1.7.9)
12.02 20:53:04 [Server] ERROR ------------------------------
12.02 20:53:04 [Server] ERROR Server thread dump (Look for plugins here before reporting to Spigot!):
12.02 20:53:04 [Server] ERROR ------------------------------
12.02 20:53:04 [Server] ERROR Current Thread: Server thread
12.02 20:53:04 [Server] ERROR PID: 23 | Suspended: false | Native: false | State: RUNNABLE
12.02 20:53:04 [Server] ERROR Stack:
12.02 20:53:04 [Server] ERROR net.sacredlabyrinth.Phaed.PreciousStones.managers.ForceFieldManager.removeSourceField(ForceFieldManager.java:632)
12.02 20:53:04 [Server] ERROR net.sacredlabyrinth.Phaed.PreciousStones.managers.ForceFieldManager.deleteField(ForceFieldManager.java:543)
12.02 20:53:04 [Server] ERROR net.sacredlabyrinth.Phaed.PreciousStones.managers.ForceFieldManager.flush(ForceFieldManager.java:2539)
12.02 20:53:04 [Server] ERROR net.sacredlabyrinth.Phaed.PreciousStones.managers.ForceFieldManager.cleanOrphans(ForceFieldManager.java:854)
12.02 20:53:04 [Server] ERROR net.sacredlabyrinth.Phaed.PreciousStones.managers.CommandManager.onCommand(CommandManager.java:2303)
12.02 20:53:04 [Server] ERROR org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
12.02 20:53:04 [Server] ERROR org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180)
12.02 20:53:04 [Server] ERROR org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:726)
12.02 20:53:04 [Server] ERROR net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerConnection.java:999)
12.02 20:53:04 [Server] ERROR net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:830)
12.02 20:53:04 [Server] ERROR net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java:28)
12.02 20:53:04 [Server] ERROR net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat.java:65)
12.02 20:53:04 [Server] ERROR net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:180)
12.02 20:53:04 [Server] ERROR net.minecraft.server.v1_7_R3.ServerConnection.c(ServerConnection.java:81)
12.02 20:53:04 [Server] ERROR net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:720)
12.02 20:53:04 [Server] ERROR net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:283)
12.02 20:53:04 [Server] ERROR net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:583)
12.02 20:53:04 [Server] ERROR net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:489)
12.02 20:53:04 [Server] ERROR net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628)
12.02 20:53:04 [Server] ERROR ------------------------------
12.02 20:53:04 [Server] ERROR Entire Thread Dump:
12.02 20:53:06 [Multicraft] Terminating server via signal