Sony Vegas Pro 13 [BLACK SCREEN AFTER RENDERING] HELP!

Alright so my video was rendering so fast, but as the video finished rendering I played the media and it show a black screen. No audio just a black screen. Please help me.
 
only thing I can think of is this, make sure that the time selection is for the ENTIRE video (explains fast rendering) and to check is, just look at the video clip and make sure that the yellow arrows are at the length of the beginning and end of the video. As for the black screen i'm not sure
 
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