vehicle advanced default skeletal mesh missing

I have been using the advanced vehicle map to try making a car racing game and has been using the default car set up in the game. But when i open up the map again today, the car is missing and when i try to press the play button, it doesnt work because there is no car to move. I then realised that in the vehicle blueprint, the skeletal mesh is missing and i cant seem to find it anywhere… Anyone knows how can i find it back??? i need it URGENTLY.