*System cannot find the file specified* and *java.lang.ClassCastException: java.util.ArrayList*

Alright, So I'm getting two errors, which I personally don't think they are that big of a deal but my server is doing some weird things. I need help. Here's my errors:

Code:

2011-05-15 00:28:33 [SEVERE] null
java.io.IOException: Cannot run program "rdiff-backup": CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessBuilder.start(Unknown Source)
    at java.lang.Runtime.exec(Unknown Source)
    at java.lang.Runtime.exec(Unknown Source)
    at java.lang.Runtime.exec(Unknown Source)
    at com.earth2me.essentials.Backup$1.run(Backup.java:55)
    at org.bukkit.craftbukkit.scheduler.CraftWorker.run(CraftWorker.java:34)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessImpl.create(Native Method)
    at java.lang.ProcessImpl.<init>(Unknown Source)
    at java.lang.ProcessImpl.start(Unknown Source)

Also, I'm getting this error while I'm pretty sure is from Essentials since it says Essentials in it.

2011-05-14 22:10:42 [INFO] §9[PLAYER_COMMAND] fishnit: /help
2011-05-14 22:10:42 [SEVERE] java.lang.ClassCastException: java.util.ArrayList cannot be cast to java.lang.String
2011-05-14 22:10:42 [SEVERE]     at com.earth2me.essentials.commands.Commandhelp.getHelpLines(Commandhelp.java:96)
2011-05-14 22:10:42 [SEVERE]     at com.earth2me.essentials.commands.Commandhelp.run(Commandhelp.java:41)
2011-05-14 22:10:42 [SEVERE]     at com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:45)
2011-05-14 22:10:42 [SEVERE]     at com.earth2me.essentials.Essentials.onCommand(Essentials.java:569)
2011-05-14 22:10:42 [SEVERE]     at org.bukkit.command.PluginCommand.execute(PluginCommand.java:35)
2011-05-14 22:10:42 [SEVERE]     at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:85)
2011-05-14 22:10:42 [SEVERE]     at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:278)
2011-05-14 22:10:42 [SEVERE]     at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:682)
2011-05-14 22:10:42 [SEVERE]     at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:645)
2011-05-14 22:10:42 [SEVERE]     at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:639)
2011-05-14 22:10:42 [SEVERE]     at net.minecraft.server.Packet3Chat.a(Packet3Chat.java:32)
2011-05-14 22:10:42 [SEVERE]     at net.minecraft.server.NetworkManager.a(NetworkManager.java:196)
2011-05-14 22:10:42 [SEVERE]     at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:75)
2011-05-14 22:10:42 [SEVERE]     at net.minecraft.server.NetworkListenThread.a(SourceFile:100)
2011-05-14 22:10:42 [SEVERE]     at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:372)
2011-05-14 22:10:42 [SEVERE]     at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:287)
2011-05-14 22:10:42 [SEVERE]     at net.minecraft.server.ThreadServerApplication.run(SourceFile:394)

 

The first error is due to some backup plugin I suspect. The second error is essentials.

 

how does one stop the default bukkit server from making backups?

 

The default bukkit server does not make backups. Are you using any wrappers (McMyAdmin, etc?)

 

i am not

 

List your plugins.

 

I am redownloading and reinstalling everything.

Ok, All Done. All the problems were caused by Essentails.

http://pastie.org/1912423

This is the current error I have. yet again, with essentials AND it's related to /help

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

I'm guessing that was fixed in a recent build, I'm not sure if they released it, so try a dev build: http://goo.gl/rcbnV