Extracting an image

HELP! I am a new user and trying to learn this program (PS6). My problem is I cannot extract an image from the photo - I outline the person I want to separate with the Magic brush, can see the dotted line, but if I click or enter I get the message no pixels selected. I am stuck.
ty

Usually when this message appears it indicates that you have a blank layer active in the layers palette rather than the layer you think you have active. Make sure the layer you are trying to select from is the active layer (click on it) and try again.

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    trace:
    image mask bounds=java.awt.Rectangle[x=250,y=250,width=500,height=500]
    cropped image bounds=java.awt.Rectangle[x=250,y=250,width=500,height=500]
    subimage image bounds=java.awt.Rectangle[x=250,y=250,width=500,height=500]
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    at com.sun.media.jai.opimage.AddOpImage.computeRectByte(AddOpImage.java:268)
    at com.sun.media.jai.opimage.AddOpImage.computeRect(AddOpImage.java:220)
    at javax.media.jai.PointOpImage.computeTile(PointOpImage.java:974)
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