Supplied NxClothDesc is not valid. createCloth returns NULL.

Im currently working on a game for my college project i finished it yesterday and am just going throught today tidying everything up and when i try to launch the game i get an error in the bottom left bar that says Supplied ' NxClothDesc is not valid. createCloth returns NULL. ' The game worked perfectly yesterday and it now it does not? I don't know enough about unity or java programming yet to go looking for this bug myself so somebody please help me?