Bukkit

What steps will reproduce the problem?
1.i'm type in chat /saveit backup
2.and console report warnings
3.

What is the expected output? What do you see instead?

[16:49:31 INFO]: djmichaelsaler issued server command: /saveit backup
[16:49:36 INFO]: Starting world save...
[16:49:36 INFO]: World save completed!
[16:49:36 INFO]: Warning! Backup has been executed!
[16:49:36 WARN]: java.io.FileNotFoundException: /home/games/minecraft/openmod/./plugins/dynmap/web/tiles/LetsFun/flat/-1_-1/z_-2_-2.png (Too many open files)
[16:49:36 WARN]: at java.io.FileInputStream.open(Native Method)
[16:49:36 WARN]: at java.io.FileInputStream.<init>(FileInputStream.java:138)
[16:49:36 WARN]: at me.dretax.SaveIt.BackUp.addFolderToZip(BackUp.java:139)
[16:49:36 WARN]: at me.dretax.SaveIt.BackUp.addFolderToZip(BackUp.java:133)
[16:49:36 WARN]: at me.dretax.SaveIt.BackUp.addFolderToZip(BackUp.java:133)
[16:49:36 WARN]: at me.dretax.SaveIt.BackUp.addFolderToZip(BackUp.java:133)
[16:49:36 WARN]: at me.dretax.SaveIt.BackUp.addFolderToZip(BackUp.java:133)
[16:49:36 WARN]: at me.dretax.SaveIt.BackUp.addFolderToZip(BackUp.java:133)
[16:49:36 WARN]: at me.dretax.SaveIt.BackUp.addFolderToZip(BackUp.java:133)
[16:49:36 WARN]: at me.dretax.SaveIt.BackUp.backup(BackUp.java:116)
[16:49:36 WARN]: at me.dretax.SaveIt.BackUp.backupdir(BackUp.java:95)
[16:49:36 WARN]: at me.dretax.SaveIt.tasks.StartManualBackup.run(StartManualBackup.java:9)
[16:49:36 WARN]: at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftTask.run(CraftTask.java:53)
[16:49:36 WARN]: at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)
[16:49:36 WARN]: at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:587)
[16:49:36 WARN]: at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:250)
[16:49:36 WARN]: at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:545)
[16:49:36 WARN]: at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:457)
[16:49:36 WARN]: at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617)
[16:49:36 INFO]: Backup Finished!

What version of the product are you using?
1.1.6 Saveit and MC Beta 1.7.2

Do you have an error log of what happened?
yes

Please provide any additional information below.

I gotta dig this up. [16:49:36 WARN]: java.io.FileNotFoundException /home/games/minecraft/openmod/./plugins/dynmap/web/tiles/LetsFun/flat/-1_-1/z_-2_-2.png (Too many open files)

Dynmap could cause the issue too.