Error Running Simple WebTest

I run: "run-webtest" at Grails Console in Eclispe

Code:
class UserWebTests extends grails.util.WebTest {

   void testSomething() {
        invoke(url:'user')
  verifyText(text:'Home')
    }

}

Error:
"Error No such property: runningFunctionalTestsInline for class:
_GrailsTest ... "

Any ideas of what could be ? Thanks!