Couldn't load Plugin.yml from pretty much every plugin installed.

Hello kind bukkit folk,
I am trying to start my server, but when I do I get a massive amount of errors stating the plugin.yml couldn't be loaded for almost every plugin I have installed. Does anyone know if I can fix this, or if it is normal. Thanks!

Link to server log: http://pastebin.com/ghkCHHAM

 

List of plugins? Did you download them all from Bukkitdev?

 

Yes. Plugins include worldborder, plugman, worldedit, commandhelper, vault, muliverse-core, permissionsex, stargate, herochat, worldguard, essentials, essentialsspawn, potionprotect, variabletriggers.

 

Please make sure that all of your plugins are up to date. Just overlooking the first error for
R: CommandHelper 3.3.0 for CB 1.1-R6Mar 02, 2012
Current Bukkit Release is 1.5.1. R0.1. Most plugins under 1.4.7. will not function properly.

 

I know nothing about Macs and ._ files but a quick Google search gave me this link - http://hints.macworld.com/article.php?story=20020217094739452 Hopefully it helps.