So I cannot use the watcher script, or is it alot of work to use?

I am using the "watcher.groovy" script along with my own script and it always outputs No signature of method: java.io.File.watch() is applicable for argument types: (Script1$_run_closure1) values: [Script1$_run_closure1@626abbd0] Possible solutions: with(groovy.lang.Closure), each(groovy.lang ...