Sorry for the late reply and lack of info I couldn't find the errors and didn't have time to test it again until now.
2012-06-08 23:25:31 [sEVERE] Could not load 'plugins\WorldGuard.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: com/sk89q/worldguard/bukkit/WorldGuardPlugin : Unsupported major.minor version 51.0
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:150)
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:310)
at forge.bukkit.ForgePluginManager.loadPlugin(ForgePluginManager.java:55)
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:231)
at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:219)
at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:195)
at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigurationManager.java:53)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:160)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.UnsupportedClassVersionError: com/sk89q/worldguard/bukkit/WorldGuardPlugin : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:41)
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:29)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:139)
... 9 more
2012-06-08 23:25:31 [iNFO] MCBans: Starting..
2012-06-08 23:25:31 [sEVERE] Could not load 'plugins\Dynmap-WorldGuard.jar' in folder 'plugins'
org.bukkit.plugin.UnknownDependencyException: WorldGuard
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:196)
at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:219)
at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:195)
at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigurationManager.java:53)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:160)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
2012-06-08 23:29:06 [iNFO] This server is running CraftBukkit version git-Bukkit-jenkins-CraftBukkit-98 (MC: 1.2.5) (Implementing API version 1.2.5-R1.3-MCPC-SNAPSHOT)[0m
I'm using the 3.0.4 server