Cloth simulation crash

I've modeled clothes for a character I'm gonna use in an animation. Everything is okay until I convert the clothes into cloth objects. It says that the geometry is invalid and when I try to simulate the clothes, Maya crashes. My character is fairly large and all the solver scale is set to 10.
How can I fix this problem?

im having exactly the same problem, I dont think you need to convert the seamed garment to a cloth object, but everytime i try to simulate Maya crashes. Ive tried using different solvers etc, but nuthin seems to work. Its really irritating cos i havnt had this problem before and im sure ive followed previous steps to the letter :@