Hello List, I used the tutorial and tried to put the Macruby.framework into my Bundle. The executable already contains the right "path" to the framework and I copied the Run Script from "Embeded Mac Ruby Target" to my regular target, so the framework is in the bundle. (Why is this an extra target at all ? No criticism, just curiosity :-) ) If I do this thing with a virgin application, the application starts on a mac without macruby installed, but if I use my learnig project "http://github.com/polarix/iterm-auto-bookmark/tree/master ", the applications starts and quit immediately, without any error. BTW If somthing went wrong, on a call to a method (ruby or object-c object) you alway get a "NoMethodError" even if the method exists. The same thing applies to RubyCocoa. See http://discussions.apple.com/thread.jspa? threadID=1957372&tstart=60 if you like. :-D with kind regards Markus