I can't see the lines of dwg from sketch-up!

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I can't see the lines of dwg from sketch-up! NATTY9410 5/5/12 1:42 AM SketchUp Version:It completes the task and even creates a folder but it is empty when i open it in autocad..i can't see anything. and i even select the whole screen if it too small but nothing..just empty! please help me!!