Bukkit

What steps will reproduce the problem?
1.player creates island
2.player deletes island

What is the expected output?
Island gets removed, no error messages?

What do you see instead? & Do you have an error log of what happened?
2013-01-07 22:59:57 [INFO] ruincastler1 issued server command: /skyblock delete
2013-01-07 23:00:01 [INFO] ruincastler1 issued server command: /skyblock yes
2013-01-07 23:00:02 [SEVERE] java.io.FileNotFoundException: orpahnedIslands.bin (The requested operation cannot be performed on a file with a user-mapped section open)
2013-01-07 23:00:02 [SEVERE]     at java.io.FileOutputStream.open(Native Method)
2013-01-07 23:00:02 [SEVERE]     at java.io.FileOutputStream.<init>(Unknown Source)
2013-01-07 23:00:02 [SEVERE]     at java.io.FileOutputStream.<init>(Unknown Source)
2013-01-07 23:00:02 [SEVERE]     at nz.Tzeentchful.SkyBlock.SLAPI.save(SLAPI.java:16)
2013-01-07 23:00:02 [SEVERE]     at nz.Tzeentchful.SkyBlock.IslandManager.saveOrphanedIslands(IslandManager.java:147)
2013-01-07 23:00:02 [SEVERE]     at nz.Tzeentchful.SkyBlock.IslandManager.deleteIsland(IslandManager.java:434)
2013-01-07 23:00:02 [SEVERE]     at nz.Tzeentchful.SkyBlock.SkyblockCommand.onCommand(SkyblockCommand.java:552)
2013-01-07 23:00:02 [SEVERE]     at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
2013-01-07 23:00:02 [SEVERE]     at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
2013-01-07 23:00:02 [SEVERE]     at org.bukkit.craftbukkit.v1_4_6.CraftServer.dispatchCommand(CraftServer.java:547)
2013-01-07 23:00:02 [SEVERE]     at net.minecraft.server.v1_4_6.PlayerConnection.handleCommand(PlayerConnection.java:990)
2013-01-07 23:00:02 [SEVERE]     at net.minecraft.server.v1_4_6.PlayerConnection.chat(PlayerConnection.java:908)
2013-01-07 23:00:02 [SEVERE]     at net.minecraft.server.v1_4_6.PlayerConnection.a(PlayerConnection.java:852)
2013-01-07 23:00:02 [SEVERE]     at net.minecraft.server.v1_4_6.Packet3Chat.handle(Packet3Chat.java:44)
2013-01-07 23:00:02 [SEVERE]     at net.minecraft.server.v1_4_6.NetworkManager.b(NetworkManager.java:290)
2013-01-07 23:00:02 [SEVERE]     at net.minecraft.server.v1_4_6.PlayerConnection.d(PlayerConnection.java:112)
2013-01-07 23:00:02 [SEVERE]     at net.minecraft.server.v1_4_6.ServerConnection.b(SourceFile:39)
2013-01-07 23:00:02 [SEVERE]     at net.minecraft.server.v1_4_6.DedicatedServerConnection.b(SourceFile:30)
2013-01-07 23:00:02 [SEVERE]     at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:585)
2013-01-07 23:00:02 [SEVERE]     at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
2013-01-07 23:00:02 [SEVERE]     at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:481)
2013-01-07 23:00:02 [SEVERE]     at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:416)
2013-01-07 23:00:02 [SEVERE]     at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)

What version of the product are you using?
R: SkyBlockCo-Op v1.5.1 for CB 1.3.2-R1.0 Oct 05, 2012

Please provide any additional information below.
Craftbukit? no I use spigot.
git-Spigot-jenkins-Spigot-381 (MC: 1.4.6) 1.4.6-R0.4-SNAPSHOT