Sikuli could locate a particular image on the screen , but still its unable to click on that image

Using the below code i could verify that a particular image is present in the screen , but still i am unable to click on the particular icon
CODE:

public class s2 {

    public static void main(String[] args) throws FindFailed{

        Socket s= new Socket("127.0.0.1", 5933);

        s.setSoTimeout(1000);

        s.setKeepAlive(true);

        ConnectionController cc = new ConnectionController(s);

        cc.openConnection(0);
        cc.setPixelFormat(0, "Truecolor", 32, 0);

        cc.start(0);

        Thread.sleep(2000);
        VNCScreen vnc = new VNCScreen();
      Region r1=vnc.exists("COPY.png");
    if (r1 != null)
        System.out.print("exists");
    else
        System.out.print("doesn't exists");

      r1.click("COPY.png"); ------------------------> could locate the image , but still it clicks on some random region.

        }
}