I used MPI_Win_free, and it returns error code: 45, Invalid MPI_Win. I checked all my code, but I still cannot find out where is the problem. I was wondering any one can give a suggestion?

I defined win as 

MPI_Win win;

in RMA, I create a sub communicator: MPI_FOR_WORLD

MPI_Win_create(image_buff, 2*image_info->image_size*sizeof(uint16), sizeof(uint16), MPI_INFO_NULL, MPI_FOR_WORLD, win);

In other MPI_FOR_WORLD process:

MPI_Win_create(MPI_BOTTOM, 0, sizeof(uint16), MPI_INFO_NULL, MPI_FOR_WORLD, win);

I use MPI_Get, just as normal thing. no mem violation.

free it as

MPI_Win_free(&win);