xcode "simulator bulid" lost

today I suddenly find that my xcode "simulator bulid" lost, I can't bulid apps to simulator target, anybody can help me ,thx a lot! I capture an image, but I can' upload, s开发者_StackOverflow中文版orry for that

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I post img to flickr. here's the link:

http://www.flickr.com/photos/16857536@N00/5282433324/