Trying to install the jm2pc server I've got the following error in console:

Exception in thread "main" java.lang.NoClassDefFoundError: jm2pc/server/gui/StartServer
Caused by: java.lang.ClassNotFoundException: jm2pc.server.gui.StartServer
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
logout

Any idea how this exception can be solved?
I'm using iOS

Thanks