Wont let me use kartsim

When i go onto rfactor 2 and go onto singleplayer it will usually come up with kartsim however i have gone onto it today and it wont come up with any other tracks or cars other than joesville speedway and the mclaren mp4. Can anyone help as to why this is doing this. Thanks

 

You probably have got a race event selected. Change it to all tracks and cars.