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Looks like your build can’t find that class. To add it, either use a buildscript block at the start of your project build to add it to your build classpath, or apply a plugin to your build which includes that class on the classpath. I’d hope/expect that the plugin authors (com.lunatech) wrote some useful docs on how to use the plugin, which perhaps show one of these methods for using the plugin in a build.

I don't think adding the class to the buildscript classpath will help, do you? I think this is more a problem of a blind copy&paste in combination with unfortunate documentation. If you look at the DSL doc of the Javadoc task, it configures exactly that doclet without adding the needed dependency, just to show how it would be done. But it seems here it was simply copied.

Fixed thanks!"