Can't get WinRun4J to work at all with my JAR

[shootie22]

I'm having issues getting it to work. The example files work together as intended, but when I try to set up my own JAR as an EXE, it fails to initialize the main class. I checked with multiple people and no one had any idea as to why this could be happening. This is the error I'm getting:

[warn] Could not find Native class
 [err] Could not find or initialize main class
java.lang.NoClassDefFoundError: IllegalName: eu/project/App
        at java.lang.ClassLoader.preDefineClass(Unknown Source)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at org.boris.winrun4j.classloader.EmbeddedClassLoader.findClass(EmbeddedClassLoader.java:98)

I tried going the other route and install the Eclipse plugin. No success with that either, it results in an error saying it can't find the jar file:

This project is exactly what I need and I can't seem to get it to work in any way, or find any other alternative. Have you guys experienced these issues? Thanks.