Why cant Cargurus sell my car !!

Apparently it is over priced.

According to KBB and Edmunds, your vehicle as described in your ad, is worth ~ $9,500. You are asking 11,000, even CarGurus shows you are $500 higher than average. So don't blame this site for lack of interested parties, it's more likely your car isn't enough of a bargain to attract buyers. You are also asking buyers to pony up more than $10K in funds, that's tough to do for most car buyers without a loan, and getting a loan on a privately owned used vehicle is harder than on a new dealer-owned one. So you just need a little more patience to reach that one person that wants your car and has the money to buy it.