No enclosing instance of type Actor is accessible. Must qualify the allocation with an enclosing instance of type Actor (e.g. x.new A() where x is an instance of Actor).

我在main()函数写调用Actress的代码，Thread actressThread = new Thread(new Actress(),"Ms.Runnable");总是出问题，问题是No enclosing instance of type Actor is accessible. Must qualify the allocation with an enclosing instance of type Actor (e.g. x.new A() where x is an instance of Actor).

求教各位！