Chevrolet Impala 1964

Hello,
on Forza 5, when I try to buy a DLC car, it tells me “ERROR OF MARKET” “This exclusive content can not be bought for now”
Can someone tell me why?
Thank you in advance.

FM5 has reached End of Life status and all DLC is now unable to be purchased.

Hey i have the same problem, is there somebody out there who is willing toan this car for the achievement, or buy, all the same to me, i will give it back when its complete, thank you very much!