I have lost a project

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I have a bit knowledge of programming. and trying to get project from rentacoder.com. I got a project but unfortunatly didn't complete on time. therefor i lost the bid and got poor rating in rentacoder. Thats all was my mistak I take project of vb6 but i work in vb.net i think i will face no difficulty but i was wrong. and got the result in poor rating