Is there any way to run OMEN by itself, and not owning a server? I was hoping I could just make map files that I could post links to, should a server hoster want to use it. When I run it, this happens:

E:\Programs\OMEN>java -Xms128M -Xmx1024M -cp Omen050.jar net.minecraftforums.osici.Omen
Exception in thread "main" java.lang.NoClassDefFoundError: com/mojang/minecraft/level/Level
at net.minecraftforums.osici.Omen(Omen.java:499)
at net.minecraftforums.osici.Omen.main(Omen.java:2571)
Caused by: java.lang.ClassNotFoundException: com.mojang.minecraft.level.Level
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPriviledged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unkown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unkown Source)
at java.lang.ClassLoader.loadClass(Unkown Source)
at java.lang.ClassLoader.loadClassInternal(Unkown Source)
... 2 more

Any ideas? Looking at the code, 2 of the errors seem to be caused by the minecraft servers being down, but I can't be sure.