There seems to be a bug in 4.0-beta-8 concerning the usage of GivenStories.
If I have a story which uses "GivenStories" then I get this exception:
If I use JBehave 3.9.3 then it works as expected.
You can reproduce it with this example: https://github.com/OttoDiesel/jbehave-selenium-example.git
In class "example/SeleniumStories.java" change story filter to:
String includes = System.getProperty("story.filter", "**/Stammdaten-Mutation.story");
It would be nice if you could fix it this week since this is the example for the second part of the paper on JBehave.