Gives Me This Error!

2013-07-28 12:00:11 [SEVERE] Could not load 'plugins/PrisonPack.jar' in folder 'plugins'
org.bukkit.plugin.InvalidDescriptionException: Invalid plugin.yml
at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:247)
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:132)
at org.bukkit.craftbukkit.v1_6_R2.CraftServer.loadPlugins(CraftServer.java:239)
at org.bukkit.craftbukkit.v1_6_R2.CraftServer.<init>(CraftServer.java:217)
at net.minecraft.server.v1_6_R2.PlayerList.<init>(PlayerList.java:56)
at net.minecraft.server.v1_6_R2.DedicatedPlayerList.<init>(SourceFile:11)
at net.minecraft.server.v1_6_R2.DedicatedServer.init(DedicatedServer.java:106)
at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:391)
at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
Caused by: java.io.FileNotFoundException: Jar does not contain plugin.yml
... 9 more
2013-07-28 12:00:11 [SEVERE] Could not load 'plugins/Reclaim.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.ClassNotFoundException: me.pandaspwnz.reclaim
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:184)
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:305)
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:230)
at org.bukkit.craftbukkit.v1_6_R2.CraftServer.loadPlugins(CraftServer.java:239)
at org.bukkit.craftbukkit.v1_6_R2.CraftServer.<init>(CraftServer.java:217)
at net.minecraft.server.v1_6_R2.PlayerList.<init>(PlayerList.java:56)
at net.minecraft.server.v1_6_R2.DedicatedPlayerList.<init>(SourceFile:11)
at net.minecraft.server.v1_6_R2.DedicatedServer.init(DedicatedServer.java:106)
at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:391)
at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
Caused by: java.lang.ClassNotFoundException: me.pandaspwnz.reclaim
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader.java:80)
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:53)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:266)
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:173)
... 9 more