--1. when programming in Java using Sikuli, you should always use sikuli-java.jar (sikuli-ide.jar contains much stuff not needed here).
--2. Set a JVM option -Dsikuli.Debug=3 when running the exe to get more details about what's going on. I guess the problem is, that for some reason the export of the native libs does not work in the context of a launch4J exe (I did not test this yet).
--3. always use the latest version (1.1.1 in this case, still nightly but pre-final ;-) http://sikulix.com